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MCAT Biology Review 8 and 9
Muscle and Bone/ Populations
52
Biology
Not Applicable
08/01/2011

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Cards

Term
Types of muscle
Definition
Smooth, Cardiac, Skeletal
Term
Functions of Muscle
Definition

Body movement

Stabilization of body position

Movement of substances through the body

Generating heat to maintain body temperature.

Term
Skeletal Muscle
Definition

Voluntary Muscle

Connects one bone to another via a tendon.

Multinucleate.

Striated.

Term
Sacromere
Definition

The shortest functional unit of the skeletal muscle.

Composed of thick and thin filament.

Term
Sarcoplastic Reticulum
Definition
The specialized endoplastic reticulum of the muscle cell.
Term
Myosin
Definition
The protein that makes up the thick filament of a sacromere.
Term
Actin
Definition
Globlar protein that makes up most of the thin filament.
Term
acetylcholine
Definition
Activates ion channels in the sacrolemma of the muscle cell creating an action potential.
Term
T-tubules
Definition
Allow the uniform contraction of the muscle by allowing the action potential to spread through the muscle cell more rapidly.
Term
Type 1 muscle fiber
Definition

Slow-twitch muscle fiber (red)

Large amount of myoglobin (makes red).

Distance swimmers

Term
Type II A muscle
Definition

Fast-twitch A fibers (red)

 

Term
Type II B Fibers
Definition

Fast-twitch B (White)

Fatiue quickly.

Contain large amounts of glycogen and low amounts of myogloboin.

Term
Cardiac Muscle
Definition

Striated - composed of sacromeres.

Contains only one nucleus.

Separated from neighbors by intercalated disks.

Involuntary.

Term
Smooth Muscle
Definition

Mainly involuntary.

Innervated by the Autonomic Nervous System.

Contain only one nucleus.

No sacromeres.

Contain intermediate filaments attached to dense bodies.

Term
Bone
Definition
Living tissue that functions to support soft tissue, protect soft tissue, assist in body movement, store minerals, produce blood cells, and store energy in adipose cells.
Term
Osteoblasts
Definition

Secrete collagen and organic compounds which bone is formed.

Incapable of mitosis.

Term
Osteocytes
Definition
Exchange nutrients and waste materials with the blood.
Term
Osteoblasts
Definition
Reabsorb bone matrix, releasing minerals back into the blood.
Term
Spongy bone
Definition
Contains red bone marrow - the site of red blood cell development.
Term
Compact bone
Definition
Contains yellow bone marrow - contain adipose cells for fat storage.
Term
Hervasian (Central) Canals
Definition
The tunnels that osteoclasts burrow through compact bone that contain blood and lymph vessels connected by crossing canals called Volkmann's canals.
Term
Osteon
Definition
The entire system of the lamellae and Haversian Canal.
Term
hydroxyapatite
Definition

Most of the Ca2+ in the body that is stored in the bone matrix as this.

Give bones great compresile strength.

Term
Cartilage
Definition
Flexible, resilient connective tissue.
Term
Mendellian Ratio
Definition
When an F2 generation is crossed to yield a 3 to 1 ratio.
Term
Phenotype
Definition
The expression of a trait.
Term
Genotype
Definition
The genetic makeup of an individual
Term
Test cross
Definition
Crossing an unknown F1 generation with a homozygous recessive to determine the genotype.
Term
Law of segregation
Definition
Alleles segregate independently of each other when forming gametes.
Term
Coodominant
Definition

Both phenotypes are expressed.

Ex: human blood

Term
Incomplete Dominance
Definition

Heterzygous individual exhibits a phenotype that is a combination of the two.

Ex: flowers

Term
Law of Independent Assortment
Definition
Genes located on different chromosomes assort independently of one another.
Term
Phenotype ratio of dihybrid cross
Definition
9:3:3:1
Term
Barr Body
Definition
The tiny dark object forrmed when one of the X chromosomes condenses in somatic cells and most of its genes become inactive.
Term
Evolution
Definition
Change in the gene pool.
Term
Vertebrata
Definition
A subphylum in the phylum chrodata.
Term
Ontogeny repitulates pylogeny
Definition
Course of development of a embryo to an adult relfects the evolutionary history of the organism.
Term
niche
Definition
The way in which a species exploits its environment.
Term
R-selection
Definition
producing large numbers of offspring that mature quickly with little or no parental care.
Term
K-selection
Definition

Small number of offspring with large parental investment.

sigmoidal growth curve that levels off at the environments carrying capacity.

Term
Speciation
Definition

The process of new species formation.

Occurs when gene flow ceases between two sections of a population.

Term
Adaptive Radiation
Definition

When several separate species arrives from a single ancestral species.

 

ex: galapagos island.

Term
Evolutionary Bottleneck
Definition
When a species faces a crisis so severe that it causes a shift in allelic frequencies of the survivors.
Term
Commensalism
Definition
Symbiosis which is beneficial for one species and non affectant for the other.
Term
Parasitism
Definition
Symbiosis that is beneficial for one species and detrimental to the other.
Term
Mutualism
Definition
Symboiosis that is beneficial for both species.
Term
Hardy-Weinberg Equilibrium
Definition
  1. Large Population
  2. Mutational Equilibrium
  3. Immigration or Emigration does not change the gene pool
  4. Random Mating
  5. No selection for the fittest organism
Term
Binomial Theorem
Definition

p2+2pq+q2

 

p+q=1

Term
Chordata
Definition

Organism with bilateral symmetry.

Deuterosomes

Have a coelom

Have a notocord, pharyngeal slits, a dorsal, hollow nerve cord, and a tail.

Term
Deuterosomes
Definition
Anus develops from or near the blastosphere
Term
coelom
Definition
body cavity within mesodermal tissue.
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