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BIo 203 Midterm
lab
242
Anatomy
Undergraduate 1
09/30/2013

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Term
describe what matter is composed of.
Definition
matter occupies space and has weight and includes all solids, gases and liquids in our environment and our bodies
Term
Describe what atoms are composed of
Definition
they are made up of protons and electrons
Term
hydrogen atom
Definition
1 proton
1 electron
Term
carbon atom
Definition
6 protons
6 neutrons
6 electrons
Term
explain what is meant by ions
Definition
if an atom gains or loses an electron making the atom have a positive or negative charge
Term
atomic number
Definition
the number of protons in an atom
Term
atomic weight
Definition
determined by the number of protons and neutrons
Term
isotope
Definition
different varieties of that element, different number of neutrons
Term
describe the three major types of atomic bond
Definition
1) covalent bonds- share electrons
2)ionic bonds- donate electrons or receive electrons
3) hydrogen bonds- weak bonds, they denature, important in maintaining the shapes of proteins
Term
Distinguish between a molecule and an atom
Definition
molecule- when atoms bond together, combination of atoms
Term
describe the use of simple and structural formulas to represent chemical compounds
Definition
see pg 6 and pg 7
Term
describe at least the first two types of chemical reactions
Definition
1)synthesis reactions- when amino acids are joined together with covalent bonds to form a protein
2)dissociation or decomposition reactions-an example is when a molecule of glycogen is broken down into its individual glucose molecules
Term
describe the second two types of chemical reactions
Definition
3)exchange reactions- (AB+CD -> AD+CB)
4)reversible reactions- ex) carbon dioxide combines with water in the blood flowing through active muscles to form carbonic acid
Term
acids
Definition
release H+ when dissolved in water
Term
bases
Definition
combine with hydrogen ions in a solution
Term
salts
Definition
leaves crystals behind
Term
electrolytes
Definition
substances that are bonded together by electrovalent bonds dissociate into their constituent ions when dissolved in water
Term
pH
Definition
the acidity or alkalinity of a solution
Term
List the major inorganic substances found in cells
Definition
water, oxygen, carbon dioxide, sodium chloride, potassium chloride, magnesium chloride, calcium chloride, sodium phosphate, sodium carbonate, sodium bicarbonate, sodium hydrogen carbonate, magnesium sulfate
Term
Organic
Definition
Carbohydrates
lipids
proteins
nucleic acids
Term
carbohydrates are divided into
Definition
monosaccharides
disaccharides
polysaccharides
Term
Lipids
Definition
triglycerides (fats)
phospholipids
steroids
Term
Nucleic acids
Definition
DNA, RNA and nucleotides
Term
monosaccharides
Definition
six-carbon-
glucose, fructose, galactose
five-carbon-
deoxyribose (DNA)
ribose (RNA)
Term
disaccharides
Definition
sucrose (C12H22O11) glucose+ fructose
lactose (glucose+ galactose)
Term
Polysaccharides
Definition
glycogen-many glucose molecules strung together
starch- vegetable
Term
triglycerides
Definition
consist of glycerol plus 3 fatty acids such as oleic, stearic, and palmitic
Term
steroids
Definition
testosterone
estradiol
cortisol
cholesterol
Term
Phospholipids
Definition
phosphatidylcholine
phosphatidylethanolamine
phosphatidylserine
phosphatidylinositol
Term
give examples of protein
Definition
albumin, hemoglobin, collagen, amylase, enzymes
cholesterol
Term
denaturation
Definition
when hydrogen bonds are broken in a protein. abnormally high or low phs and heat
Term
list the three components of a nucleotide
Definition
a nitrogen containing base
a 5 carbon sugar
one or more phosphate groups
Term
KCl
Definition
potassium chloride
Term
MgCl2
Definition
magnesium chloride
Term
CaCl2
Definition
calcium chloride
Term
MgSO4
Definition
magnesium sulfate
Term
H3PO4
Definition
phosphoric acid
Term
NaH2PO4
Definition
monosodium phosphate
Term
Na2HPO4
Definition
disodium phosphate
Term
Na3PO4
Definition
trisodium phosphate
Term
NH3
Definition
ammonium chloride
Term
NH4Cl
Definition
ammonium chloride
Term
glucose
Definition
C6H12O6
Term
sucrose
Definition
C12H22O11
Term
chemical makeup of triglycerides
Definition
one molecule of glycerol covalently bound to three fatty acid molecules
Term
chemical makeup of phospholipids
Definition
one molecule of glycerol covalently bound to two fatty acid molecules
Term
chemical makeup of cholesterol
Definition
multiple ring structure, amino acid side chains
Term
general structure of an amino acid
Definition
has an NH2 group at one end and a COOH group (carboxyl group at the other.
amino acids are joined viz covalent bonds
Term
describe the basis of some genetic diseases
Definition
seem to involve a change (mutation) in one amino acid in an important protein (such as an enzyme or structural protein) the consequences can be tragic
Term
explain the five levels of organization in the body
Definition
1) molecules ex) water, DNA
2)cells ex)white blood cells
3)tissues ex)muscle tissue, nerve tissue
4)organs
5)systems ex) digestive system, reproductive system
Term
LOOK AT PG 20 for cavities
Definition
dorsal, ventral
cranial thoracic
ventral abdomino pelvic
Term
cranial
Definition
brain in the dorsal cavity
Term
vertebral
Definition
spinal cord part of the dorsal cavity
Term
thoracic
Definition
trachea
lungs
heart
esophagus
thymus
part of the ventral cavity
Term
abdominal
Definition
gall bladder
liver
intestines
stomach
spleen
part of the abdominopelvic in the ventral cavity
Term
pelvic
Definition
large intestine
reproductive organs
urinary bladder
Term
small head cavities
Definition
1)oral (teeth and tongue)
2) orbital (eyes etc.)
3)nasal (connected to sinuses)
4)middle ear (middle ear bones)
Term
list the membranes associate with the thoracic and abdominopelvic cavities
Definition
thoracic
1)pleural-lines thoracic cavity and covers lungs
2) pericardial-surrounds heart and covers its surface
abdominopelvic cavity
peritoneal-lines abdominopelviv cavity and covers organs inside (stomach, intestines etc.
Term
integumentary
Definition
skin, glands hair
Term
skeletal system
Definition
bones
Term
muscular system
Definition
muscles
Term
nervous system
Definition
nerves
Term
endocrine system
Definition
hormones
Term
digestive system
Definition
stomach, mouth
Term
respiratory system
Definition
lungs
Term
circulatory system
Definition
blood vessels
Term
lymphatic system
Definition
lymph nodes
Term
urinary system
Definition
kidneys, bladder
Term
reproductive system
Definition
reproductive organs
Term
Body covering
Definition
integumentary system
Term
support, protection, movement
Definition
skeletal system, muscular systemq
Term
integration and coordination
Definition
nervous system, endocrine system
Term
processing and transporting
Definition
digestive system
respiratory system
circulatory system
lymphatic system
urinary system
Term
reproduction
Definition
reproductive system
Term
Superior/inferior
Definition
superior= toward the head
inferior= away from the head
Term
anterior/posterior
Definition
anterior=toward the front
posterior= toward the back
Term
medial/lateral
Definition
medial=toward the midline
lateral=toward the side
Term
proximal/distal
Definition
proximal-toward the main mass of the body
distal=away form the main mass of the body
Term
superficial/deep
Definition
superficial-toward the surface of the body
deep- away form the suface of the body
Term
central/peripheral
Definition
central- at the center
peripheral-around the outside
Term
sagittal
Definition
divides the body into left and right portions
Term
transverse
Definition
any cut that divides the body into superior and inferior segments
Term
coronal
Definition
a cut that divides the body into anterior and posterior portions
Term
acromial
Definition
point of shoulder
Term
brachial
Definition
upper arm
Term
antebrachial
Definition
forearm
Term
antecubital
Definition
space in front of elbow
Term
axillary
Definition
armpit
Term
buccal
Definition
cheek
Term
cehallic
Definition
head
Term
cervical
Definition
neck
Term
costal
Definition
ribs
Term
cubital
Definition
elbow
Term
digital
Definition
finger
Term
frontal
Definition
forehead
Term
mammary
Definition
breast
Term
pectoral
Definition
chest
Term
plantar
Definition
sole of foot
Term
umbilical
Definition
naval
Term
vertebral
Definition
the vertebra or spinal columnn
Term
draw circle diagram
Definition
go
Term
The four stages of mitosis are
Definition
1)prophase-chromatin condenses to form visible chromosomes. Nucleolus disappears
2)metaphase-mitotic spindle stretched across the cell, centromere for each chromosome becomes attached to a spindle fiber
3)anaphase-centromeres divide, one centromereis attached to a spindle fiber that leads to one end of the cell
4)telophase- nucleus reforms, the chromosomes unwind and disperse, the nucleolus reappears
Term
define what is meant by cell differentiation and what this means in terms of gene expression
Definition
differentiation-the daughter cells start to look different from one another some become skin cells or bone cells... gene expression- some genes are turned off and some are turned on page 43
Term
apoptosis and 1 example
Definition
cell suicide
ex) webs of skin between the fingers and toes fo the fetus are destroyed
Term
describe the ways in which cells differ from each other
Definition
pg 43
Term
draw a cell and label the plasma membrane, nucleus, nucleolus, endoplasmic reticulum (rough and smooth0 Golgi apparatus and mitochondria
Definition
go
Term
describe the molecular architecture of the plasma membrane and relate it to function
Definition
hydrophilic Polar head groups, fatty acid tails
it is freely permeable to lipid soluble substances such as oxygen and carbon dioxide. it is impermeable to water souluble subatances like sugars, amino acids and ions
Term
glycolipids
Definition
contain bound carcobydrates . thery are found in the outer half of the bilayer, and are involved in mediating cell to cell recognition
Term
cholesterol molechules
Definition
play an important role in stiffening the membrane pg 33
Term
endoplasmic reticulum
Definition
transports materials within the cell, provides attachment for ribosomes and synthesizes lipids
Term
ribosomes
Definition
synthesize proteins
Term
Golgi apparatus
Definition
packages and processes proteins and other macromolecules for secretion of for transport to other parts of cell
like a post office
Term
mitochondria
Definition
oxidize carbon fuels the energy released being packaged in ATP molecules
Term
lysosomes
Definition
represent the cell's garbage disposal system. contain enzymes capable of digesting substances that enter cells and worn-out organelles such as mitochondria
Term
peroxisomes
Definition
contain enzymes
Term
centrosomes
Definition
help distribute chromosomes to daughter cells during cell reproduction and inititate formation of cilia
Term
cilia and flagella
Definition
motile
Term
increase surface area
Definition
microvilli
Term
vesicles
Definition
contain various substances that recently entered the cell and store newly synthesized molecules
Term
microfilaments and microtubules
Definition
support cytoplasm and help move substances and organelles within the cytoplasm
Term
inclusions
Definition
storage of triglycerides, carbohydrates, melanin granules which cause skin pigmentation
Term
describe the structure of the nucleus and what it contains
Definition
the nucleus is surrounded by the nuclear envelope which contains nuclear pores that allow passage of large molecules between the nucleus and cytoplasm
1)nucleolus-produces ribosomes
2)chromatin-molecules of DNA that contain info needed for protein synthesis
3)nuclear matrix- consists of a variety of molecules that play a role in gene expression
Term
list the three ways in which substances can pass across the plasma membrane without the need for energy expenditure by the cell
Definition
physical prosses- don't require energy
1)simple diffusion
2)facilitated diffusion
3) osmosis
Term
need energy
Definition
physiological processes
1)active transport
2)endocytosis
3)exocytosis
Term
be able to draw general layout of an epithelium
Definition
go
pg 51
Term
identify slides
Definition
look at examples on google
Term
simple squamous epithelium
Definition
diffusion
filters blood in kidney
lines blood vessels (vascular endothelium
lines body cavities (meothelium)alveoli of lungs- the exchange of oxygen and CO2
Term
simple cuboidal epithelium
Definition
made up of a single layer of cube-shaped cells that function toward absorption, secretion and excretion.
FOUND: covering the surface of the female ovaries, lining the capsule of the lens of the eye, forming the tublule system in the kidneys where it is involved in the reabsorption of water. It can also be found lining small ducts and glands where secretion is involved
Term
Simple columnar epithelium
Definition
Found: line the small intestine have microvilli function to increase the surface area of the columnar cells that function to absorb nutrients as they passthrough the small intestine. contain mucus secreting goblet cells that functions as a lubricant, cilia are found of the columnar cells of the upper respiratory tract and in the female's uterus and fallopian tubes
FOUND: stomach, nasal sinus ,aand central canal of the spinal cord
Term
pseudostratified columnar epithelium
Definition
nuclei at various depths in cell
found: upper respiratory tract, in some parts of the male reproductive system, the epithelium functions to entrap foreign particles in the mucus and then to remove such substances through the action of cilia that propel the entrapped particles upward out of respiratory tract. In the reproductive sytem the cilia aid in the movement of sex cells
Term
Stratified squamous epithelium
Definition
many layers,
found in outer layer of the skin (epidermis) and found lining the mouth , throat, esophagus , vagina, and anal canal, keratin causes the top cells to harden and die, provide protective barrior
Term
transitional epithelium
Definition
outher cells are cuboidal in shape not flat like stratified squamous.
can chance shape in under the influence of pressure
found: urinalry bladder and other parts of the urinary tract
Term
glandular epithelium
Definition
a single cell or a group of cells that secrete substances produced within the cell of group of cells into ducts onto surfaces into tissues or into the blood
Term
different types of glands
Definition
exocrine glands-secrete their cellular products into ducts that lead to a free surface, be it the skin or the lumen of a how organ
includes sweat glands, salivary glands and the goblet cells. Endocrine gland does not have a duct or conduit through which the secretions travel, rather these secretions are dumped directly into the bloodstream.
Term
name the eight functions of connective tissue
Definition
1) binds structures together
2)supports and protects
3)serves as a framework
4)fills up spaces
5)stores fat
6) generates blood cells
7)protects against infections
8)helps repair tissue damage
Term
name five cell types found in connective tissue and describe their function
Definition
1)fibroblasts-produce fibers
2)macrophages-phagocytize cellular debris bacteria etc, important in inflammatory response
3)mast cells- full of granules which contain histamine, heparin and proteases(enzymes that digest proteins) ...
4)white blood cells- increase dramatically during inflammation. ex)neutrophils
5)specialized cells-chondrocytes and osteocytes
Term
name the two types of fibers
Definition
collagen and elastic
Term
name the special type of protein found in the ground substance of connective tissue
Definition
proteoglycans-they bind water and play an important role in maintaining the hydration of a tissue
Term
Loose connective tissue/ areolar connective tissue
Definition
no dominant fiber
provides flexibility and strength
FOUND: surrounding blood vessels and nerves, muscle fibers and muscle groups and binding skin to underlying muscles
Term
adipose tissue
Definition
no fibers
shock absorber, insulates, fills spaces, cushions, gives shape to body surfaces, holds organs in place
FOUND: around the eyes, around many organs, and at the joints
Term
dense regular connective tissue
Definition
predominantly collagen fibers that are densely packed and arraged parallel to the direction of the force
poor blood supply so it heals slowly
FOUND: tendons,ligaments, and aponeuroses (sheet-like tendons connecting one muscle with another or with bone
Term
Dense irregular connective tissue
Definition
predominantly collagen fibes. Interwoven in three dimensions like a basket weave they provide strength in all directions, limited blood supply that makes the healing process very slow
FOUND: dermis of the skin, in sheaths covering muscles, nerves and in the adventitia of blood vessels. Also found forming capsules covering various organs and joints, making up the sclera of the eye and the membrane covering cartilage and bone
Term
elastic connective tissue
Definition
elastic fibers
can be stretched and recoil
FOUND: walls of arteries, in the trachea, and lungs, in the larnx and between adjacent vertebrae
Term
reticular connective tissue
Definition
made up of a network of thin collagen fibers
provides a supporting framework for a number of organs
FOUND: liver, spleen, and lymph nodes
Term
five functions of skin
Definition
1)regulation of body temp
2)protection
3)sensation
4)excretion
5)synthesis of vitamin D
Term
describe the structure of skin and include all of its layers
Definition
epidermis
-stratum corneum
-stratum granulosum
-stratum spinosum
-stratum basale
dermis
subcutaneous layer pg 72 and 73
Term
list the three accessory structures of skin
Definition
1)hair follicles
2)glands
3)nails
Term
describe the structure of a hair follicle
Definition
a smooth muscle called arrector pili extends from te dermis to the side of the hair follicle,
a sebaceous or oil gland is connected to the hair follicle see page 74
Term
what is keratinization? to what group of chemical substances does keratin belong/
Definition
keratinization-where cells die and become packed with a tough, fibrous, waterproof protein called keratin. its a protein
Term
describe the three types of glands associated with the skin
Definition
sebaceous glands-associated with hair follicles, secrete an oily material called sevum, keeps the hairs and skin soft and pliable
2)sweat glands-
1-aporine glands
2-merocrine glands/called eccrine
have an odor
3)ceruminious glands- modified sweat glands found only in the external ear canal
Term
define a gland
describe the difference between endocrine and exocrine glands
Definition
endocrine secrete hormones into the blood stream
exocrine glands have ducts that realse the produces they produce
Term
how do bones develop and grow
Definition
either intermembranous or enchondral ossification
Term
intramembranous if
Definition
occurs in fibrous connective tissue
Term
examples of intrmembranous bones
Definition
flat bones of the skull
the mandible and clavicle
Term
how are intramembranous bones formed
Definition
these bones begin as layer of vascularized fibrous connective tissue. Osteoblasts, bone forming cells differentiate from osteoprogenitor cells and begin to deposit a bony calcified matrix around themselves. Eventually as more and more matrix gets deposited the osteoblasts become totally surrounded by the matrix and are left within small cavities called lacunae. They are now called osteocytes. the bone that forms is spongy bone
Term
most bones are made by
Definition
enchondral ossification
Term
enchondral ossification
Definition
1)the cartilaginous model tibia is ensheathed in peichondrium
2)a periosteal collar forms, a primary ossification center develops, where bone replaces cartilage and a marrow cavity appears
3)blood vessels invade from the perichondrium, penetrating the marrow cavity. The artilage model continues to grow at its ends
4)periosteal collar thickens and lengthens due to theactivity of osteoblasts in the periosteum. Secondary ossification centers appear at the epiphyses when spongy bone is layed down
......see page 86
Term
name the types of bone and give an example each
Definition
1)long-femur
2)short-equal in length and width/ bones in the wrist or of the ankle transfer forces
3)flat- somewhat broad and thin skull, ribs
4)irregular- variety of shapes ex)vertebrae
5)round/sesamoid-some bones in wrist and the patella occur within tendons at joints the endure a lot of pressure
Term
name the parts of a long bone
Definition
diaphysis-long portion of the bone
epiphyses-ends of the long bone
the epiphyses are covered in hyaline cartilage called articular cartilage.
Dense irregular connective tissue called periosteum covers the remainder of the surface of the bone
page 85
Term
how is bone similar to reinforced concrete
Definition
it provides compressional strength, and it contains steel rods/collagen fibers (providing tensile strength)
calcium phosphate mainly in the formof mineral hydroxylapatite is like concrete it provides compressional strength pg 83
Term
draw the microscopic organization of compact bone
Definition
draw!!
Term
list and describe the four types of cell found in bone
Definition
osteoblasts-bone forming cells
osteoclasts-break down bone
osteoprogenitors-
osteocytes- found in lacunae
Term
osteoporosis
Definition
a disorger in which there is excessive loss of bone mass and mineral content
Term
name 5 factors that affect bone growth and development
Definition
1) nutrition-minerals
2)nutrition-vitamins
3)hormones
4) exercise
5) aging
Term
nutrition-minerals
Definition
there must be adequate intake of calcium, phosphorus in the form of phosphate and other elements including boron and manganese
Term
nutrition vitamins: vitamin D
Definition
required for the proper reabsorption of calcium in the small intestine-calcium that is used as the matrix material for bone tissue.
Term
when vitamin D is deficient
Definition
in children- rickets
in adults- osteomalacia
Term
hormones
Definition
1)growth hormone
2)calcitonin- influences calcium metabolism
3) sex hormones
4) parathyroid hormone-increase the amount of calcium ions in the blood
5) thyroid hormones-stimulate bone resorption
Term
exercise
Definition
puts physical stress on the bones to which are attached skeletal muscles. Makes bones thicker and stronger
Term
aging
Definition
osteoporosis is particularly serious in women after menopause
Term
immovable joints
Definition
synarthrosis
Term
slightly movable
Definition
amphiarthrosis
Term
freely movable
Definition
diarthrosis
Term
based on structure joints are classified into three groups
Definition
1)fibrous
2)cartilaginous
3)SYNOVIAL
Term
EXAMPLES of fibrous
Definition
syndesmosis- distal end-tibia/fibula
suture-skull
gomphosis- teeth
Term
cartilaginous joints
Definition
synchondrosis- rib to sternum
symphysis- intervertebral disks, symphsis pubis
Term
SYNOVIAL!
Definition
freest movement
1)ball and socket-leg shoulder
2)condyloid-wrist
3)gliding- c1,c2
4) hinge- elbow
5)pivot- clavicles
6)saddle- root of thumb
7)bicondylar- knee
Term
describe the four structures that make up a synovial joint
Definition
1)articular cartilage- reduces friction
2)joint capsule- 2 parts outer layer of dense connective tissue that attaches itself to the periostem
3)synovial membrane-covers all areas of the joint capsule except for those covered by articular cartilage
4)synovial cavity-contains a clear thick fluid called synovial fluid to moisten and lubricate the surfaces of the joint
Term
Axial skeleton
Definition
skull
hyoid bone
vertebral column
any head bones
sacrum coccyx
ribs
Term
appendicular skeleton contains
Definition
clavicle, scapula, arm and leg bones,coxa
Term
cranium
Definition
one frontal, two temporal, two parietal, one occipital, sphenoid and ethmoid
Term
facial
Definition
maxilla, mandible, zygomatic
Term
middle ear
Definition
stapes, malleus, and incus
Term
hyoid bone
Definition
in neck
Term
vertebral column
Definition
1) 7 cerical vertebrae (atlas & axis)
2) 12 thoracic vertebrae
3) 5 lumbar vertebrae
4) 5 sacral vertebrae fused to form sacrum
5) 4 coccygeal vertebrae fused to form the coccyx
Term
thoracic cage
Definition
24 ribs and the sternum (breast bone)
1) true ribs (14)
2) false ribs (10)
3)sternum (breastbone), manubrium, body and xiphoid process
Term
appendicular skeleton
Definition
pectoral girdle
1) clavicle
2)scapula
Term
arm
Definition
1)humerus
2)ulna
3)radius
Term
hand
Definition
1)carpal bones (8) wrist
2)metacarpal bones (5) palm
3) phalages (14) fingers
Term
pelvic girdle
Definition
1)ilium:hipbone (hands on)
2)ischium seat (sit on)
3)pubis (try not to get kicked in)
Term
leg
Definition
1)femur
2)tibia
3)fibula
4)patella
Term
foot
Definition
tarsal bones (7) ankle
metatarsal bones (5) sole
phalanges (14) toes
Term
be able to describe the following joints
Definition
shoulder joint
elbow joint
hip joint
knee joint
101-105
Term
skeletal muscle
Definition
HEART
have cross striations
uni-nuclated
have an intercalated disc
involuntary
Term
smooth
Definition
doesn't have- cross striations, sacromeres, troponin or tropomyosin
Term
skeletal
Definition
multi nucleated
Term
look up in lecture notes
Definition
fasic, aponeurosis, tendon, fascicle, epimysium,perimysium, and endomysium
Term
be able to identify slides of each type of muscle
Definition
histology atlas or google
Term
describe the function of connective tissue in skeletal muscle
Definition
tendons?
Term
the cytoplasm of a muscle fiber is called
Definition
sarcolemma
Term
the cytoplasm is called
Definition
sarcoplasm
Term
the sacrolemman is invaginated at many points to form structrues called
Definition
transverse tubules or T-tubules
Term
the sarcoplasm contains many
Definition
mitochondria
Term
the endoplasmic reticulum is called
Definition
sarcoplasmic reticulum
Term
the sarcoplasm contains
Definition
myofibrils composed of thick filaments of myosin molecules and thin filaments of actin molecules.
Term
the thin filaments are associated with two other proteins called
Definition
troponin and tropomyosin
Term
the arrangement of these large protein molecules and the myofibrils in which they occur is so regular that it gives the skeletal muscle fiber a cross-striated appearance.
Definition
these cross-striations have various designations. they include the Z-line, the A-band and the I-band. The Z-line represents a point at which the ends of the thin filaments are attached. that part of a myofibril between two Z-lines is called a sarcomere
Term
sketch a myofibril
Definition
find some paper! page 108 ish
Term
draw a diagram showing how the thin and thick filaments are organized in the sarcomere
Definition
go 109 ish
Term
list the five steps involved in the contraction of a muscle fiber
Definition
1)excitation of motor neuron
2)release of Actlycolene into neuromuscular junction
3)depolarization of sarcolemma
4)release of Ca+ from sarcoplasmic reticulum
5)contraction of sarcomere
Term
explain how muscles work together to create smooth coordinated movement
Definition
113ish
Term
describe the neuromuscular junction
Definition
the synapse is called a neuromuscular junction. only one neuromuscular junction is found per muscle fiber
at the neuromuscular junction the plasma membrane of the receiving muscle fiber is modified to form the motor end plate pg 121
Term
Name the neurotransmitter used in the neuromuscular junction
Definition
ACETYLCHOLINE
Term
Describe the function of calcium in skeletal muscle contraction
Definition
all muscles need calcium
after a wave of depolarization spreads over the sarcolemma and penetrates into the interior of the muscle fibers, calcium ions are released. these calcium ions bind to troponin which causes a shape change in the molecules of tropomyosin.
Term
understand the physiology of muscle contraction
Definition
1)resting condition, the myosin is primed and ready for action
2)attachment of myosin head to actin
3)power stroke (rower pulling oar)
4) detachment and reorientation (rower raises oar and brings it forward again)
5)preparation and priming for next attachment step
Term
threshold stimulus
Definition
the about of stimulation a muscle fiber has to have to contract
Term
all or none phenomenon
Definition
applies to single muscle fibers. A stimulus is either sufficient to cause a maximum contraction or it is subrthreshold and there is no contraction at all
Term
motor unit
Definition
a motor neuron and all the muscle fibers it is connected with
Term
properties of a motor unit
Definition
they allow us to grade the force and speed of whole muscle contraction. it takes many neurons to controlthe contraction of a particular muscle
Term
explain motor recruitment
Definition
increasing the number of motor neurons and therefore motor units activated at any one time can increase the force of contraction of the muscle
Term
explain what is meant by muscle tone and how it relates to posture and maintaining balance
Definition
-muscle tone- some fibers in such a muscle are contracted while others are relaxed-if you faint,...
Term
define tetanic contraction and distinguish it from a twitch
Definition
-tetanic contraction- most of the contractions made by our muscles during voluntary activity, because the motor neurons controlling them typically send out rapid bursts of action potentials when activated
-twitch- the response of a whole muscle to a single stimulus
Term
Name the two types of cell found in nervous tissue
Definition
1) neurons-nerve cells
2) neuroglial/glial cells
Term
name one type of glial cell
Definition
oligodnendrocytes-produce a phospholipid myelin sheath
microglia- brains macrophages
Term
draw and label a neuron
Definition
go
Term
neurons
Definition
varied in shape and size. consites of a cell body with processes radiating from it called dendrites and axons. Dendrites have numerous dendritic spines projection from their surfaces and conduct nerve impulses towards the cell body
can be bipolar, unipolar, multipolar
Term
sensory neurons
Definition
neurons that are involved in conveying sensory info to the central nervous system
Term
interneurons
Definition
neurons that convey info from one neuron to another neuron
Term
motor neurons
Definition
convey motor comands
Term
name the two sensory receptors that convey to the brain information on the length and tension developed by a skeletal muscle
Definition
Golgi tendon organs- located in the tendons provide data on the tension being developed by the muscle
muscle spindles- located within the body of the muscle provide data on the changing length of muscle during contraction or when it is stretched
Term
explain the ways in which muscles interact to produce smooth, coordinated movements
Definition
-when the prime mover contracts, it often acts in concert with other "helper" muscles that...
Term
advantages and disadvantages of the lever system
Definition
advantages: large movents of limbs can be made with far less shortening of the muscles
disadvantages: because the muscles must exert many times more effort (inforce) to overcome the resistance (outforce) created at the end of the limb
Term
first class levers
Definition
the fulcrum is in between the in-force and the out-force. This is a common arrangement for the muscles that produce extension of body parts
ex) extension of the forearm by the triceps, lifting the head
Term
second class levers
Definition
no good examples
FOI
fulcrum, outforce, in-force
Term
third class levers
Definition
fulcrum, in-force, out-force
arranged so that the inforce is between the outforce and the fulcrum. Very common in the body. Produces flexion of body parts
ex) flexion of the forearm by biceps brachii
Term
be able to draw biceps brachii as a lever
Definition
pg 150-151
Term
endomysium
Definition
layer of connective tissue that surrounds an individual muscle fiber
Term
epimysium
Definition
layer of connective tissue that surrounds a skeletal muscle
Term
fascia
Definition
connective tissue located between adjacent muscles
Term
fascicle
Definition
a small bundle of muscle fibers
Term
perimysium
Definition
layer of connective tissue that separates a muscle into small bundles called fascicles
Term
sarcolemma
Definition
cell membrane of a muscle fiber
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