NSCA CSCS; Questions & Answers 100% Solved
epimysium Answer-continuous tissue encompassing the muscle, consistent with tendons
tendon Answer-links muscle to bone
bone periostium Answer-specialized connective tissue covering all bones
proximal Answer-closer to the trunk
distal Answer-farther f...
perimysium Answer-covers bundles of muscle fibers (fascicli)
endomysium Answer-surrounds each individual muscle fiber
sarcolemma Answer-continuous with the muscle fibers membrane and endomysium
motor neuron Answer-nerve cell
neuromuscular junction Answer-where a nerve cell innervates muscle fibers, each muscle
cell has only one, a motor neuron innervates many muscle fibers
motor unit Answer-motor neuron and the muscle fibers it innervates
sarcoplasm Answer-cytoplasm of a muscle fiber, contains contractile components which
consist of protein filaments, other proteins, stored glycogen and fat particles, enzymes, and
specialized organelles such as mitochondria and the sarcoplasmic reticulum
myofibrils Answer-contained in the sarcoplasm, contains myofilaments responsible for
contracting the muscle
,NSCA CSCS; Questions & Answers 100% Solved
myosin Answer-thick myofilament with cross bridges that protrude away at regular
intervals
cross bridges Answer-attached to myosin
actin Answer-thin myofilament of two strands arranged in a double helix
sarcomere Answer-smallest contractile unit of skeletal muscle
A-Band Answer-dark corresponding with the alignment of myosin
I-Band Answer-light corresponding actin of adjacent sarcromeres
Z-Line Answer-in the middle of the I-Band, appears as a thin, dark line running
longitudinally
H-Zone Answer-area in the center of the sarcomere where only myosin filaments are
present. During contraction, this decreases as actin slides over the myosin toward the center of
the sarcomere
sarcoplasmic reticulum Answer-system of tubules surrounding each myofibril
, NSCA CSCS; Questions & Answers 100% Solved
T-Tubules Answer-run perpendicular to the sarcoplasmic reticulum and terminate in the
vicinity of the z-line between two vesicles
action potential Answer-electrical nerve impulse
sliding filament theory Answer-actin filaments at each end of the sarcomere slide inward
on myosin filaments, pulling z-lines toward the center of the sarcomere and thus shortening the
muscle fiber
troponin Answer-a protein that is situated at regular intervals along the actin filament
and has a high affinity for calcium ions
tropomyosin Answer-funs along the length of the actin filament in the groove of the
double helix
acetylcholine Answer-diffuses across the neuromuscular junction, causing excitation of
the sarcolemma
all or none principle Answer-once a sufficient amount of acetylcholine is released, an
action potential is generated across the sarcolemma and the fiber contracts, more acetylcholine
does not cause a stronger contraction.
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