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Chapter 9 Level 1
Muscle and Muscle Tissue
52
Anatomy
Undergraduate 2
03/09/2009

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Term
zygomatic
Definition
forms the cheek and part of the orbit
Term
movement would damage the delicate blood vessels
Definition
Why are there no blood vessels inside the joint cavity of synovial joints?
Term
olecranon process
Definition
is one of the two prominent processes at the proximal end of the ulna that looks like the "business end" of a monkey wrench.
Term
Protection
Definition
is NOT a function of the muscular system
Term
Perimysium
Definition
surrounds bundles of fibers (fasciculi)
Term
endomysium
Definition
surrounds each fiber
Term
epimysium
Definition
surrounds the entire muscle
Term
motor unit
Definition
is a nerve-muscle functional unit, with a motor neuron supplying all the muscle fibers.
Term
True
Definition
True or False
Increase of hemoglobin concentration in muscle fibers is NOT a process during muscle contraction
Term
Ca2+
Definition
What is the ion released from the terminal cisternae that combines with troponin and removes the blocking action of tropomyosin, resulting in formation of cross bridges?
Term
neuromuscular junction
Definition
Each skeletal muscle fiber is controlled by a neuron at a single what?
Term
triad
Definition
a set of three membranous channels, and is formed by a single transverse tubule and two terminal cisternae, or elements of the sarcoplasmic reticulum
Term
sliding filament model
Definition
during contraction, actin and myosin filaments overlap to a greater degree, shortening the muscle fiber.
Term
muscle contraction
Definition
Interactions between actin and myosin filaments of the sarcomere are responsible for
Term
all-or-none response of a muscle fiber
Definition
means that a muscle fiber responds maximally to threshold stimulation or NOT at all
Term
epimysium
Definition
dense layer of collagen fibers that surround an entire skeletal muscle
Term
sarcomere
Definition
functional unit of a skeletal muscle fiber
Term
false
Definition
True or False
The role of calcium in muscle contraction has everthing to do with Na+
Term
synaptic cleft
Definition
space between the neuron and the muscle
Term
muscle tone
Definition
term that means a continued mild or partial contraction of an entire muscle
Term
isometric
Definition
type of muscle contraction in which the muscle fibers produce increased tension but the muscle neither shortens nor lengthens
Term
Calcium ions
Definition
WHAT binds to the troponin-tropomyosin complex and remove their inhibitory action on actin/myosin interaction
Term
Smooth muscle fibers
Definition
are small and spindle-shaped
Term
Cardiac muscle
Definition
has branching fibers and is striated and involuntary
Term
Skeletal muscle
Definition
has peripherally located nuclei and has rapid and forceful contractions
Term
cardiac muscles
Definition
muscles that are responsible for pumping action of the heart
Term
muscle contraction
Definition
ATP, CP, glucose, and oxygen all decrease during _________________
Term
action potential
Definition
is the result of a predictable sequence of electrical changes that occurs along the length of the sarcolemma
Term
Na+, K+
Definition
When the 1.____ channels close, 2.____ channels open, allowing rapid diffusion of K+ out of the muscle fiber
Term
Repolarization
Definition
is restored when K+ ions restore the electrical charge
Term
Ionic restoration
Definition
occurs when the Na+/K+ pump reestablishes the normal ionic balance across the membrane
Term
calcium pump
Definition
is dependent on ATP to remove calcium from the sarcoplasm
Term
Elastic filaments
Definition
maintain the organization of the A band and provide for elastic recoil when muscle contraction ends
Term
Calmodulin
Definition
causes smooth muscle contractions
Term
smooth muscle
Definition
Only ____________ cells can divide
Term
Multiunit smooth muscle
Definition
controls pupil size
Term
skeletal muscle
Definition
described as striated, voluntary, multinucleate
Term
smooth muscle tissue
Definition
walls of hollow organs and some blood vessels contain this muscle tissue
Term
cardiac muscle tissue
Definition
has intercalated dics
Term
85%
Definition
percentage of body heat is generated by muscle tissue
Term
muscle fascicle
Definition
bundle of muscle fibers
Term
sacromere
Definition
smallest contractile unit of skeletal muscle
Term
troponin and tropomysin
Definition
major regulatory proteins in muscle tissue
Term
skeletal muscle
Definition
involved in eye movement
Term
True
Definition
True or False
Muscle fibers stretch during muscle contraction
Term
acetycholinesterease degrades acetylcholine
Definition
process aids in skeletal muscle relaxation after contraction
Term
eye
Definition
single motor neuron may innervate as few as a 3-5 fibers in muscles
Term
fibromyalgia
Definition
characterized by painful musculoskeletal "tender points"
Term
anabolic steroids
Definition
builds muscle poroteins
increases muscle strength
can result in liver cancer and heart disease
Term
False
Definition
True or False
young persons have more adipose in muscles compared to elderly persons
Term
True
Definition
True or False
aging is accosiated with decreased mygolbin production
Term
paranasal sinuses
Definition
frontal , maxiallary, ethmoid, and sphenoid bones are part of what?
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