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NSCA CSCS Vocabularies Review ( 2026/2027 Update) Questions and Answers
NSCA CSCS Vocabularies Review (
2026/2027 Update) Questions and
Answers
Q: perimysium
Answer:
covers bundles of muscle fibers (fascicli)
Q: endomysium
Answer:
surrounds each individual muscle fiber
Q: sarcolemma
Answer:
continuous with the muscle fibers membrane and endomysium
Q: motor neuron
Answer:
nerve cell
Q: neuromuscular junction
Answer:
where a nerve cell innervates muscle fibers, each muscle cell has only one, a motor neuron
innervates many muscle fibers
Q: motor unit
Answer:
motor neuron and the muscle fibers it innervates
Q: 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
Q: myofibrils
Answer:
contained in the sarcoplasm, contains myofilaments responsible for contracting the muscle
Q: myosin
Answer:
thick myofilament with cross bridges that protrude away at regular intervals
Q: cross bridges
Answer:
attached to myosin
Q: actin
Answer:
thin myofilament of two strands arranged in a double helix
Q: sarcomere
Answer:
smallest contractile unit of skeletal muscle
Q: A-Band
Answer:
dark corresponding with the alignment of myosin
Q: I-Band
Answer:
light corresponding actin of adjacent sarcromeres
Q: Z-Line
Answer:
in the middle of the I-Band, appears as a thin, dark line running longitudinally
Q: 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
Q: sarcoplasmic reticulum
Answer:
system of tubules surrounding each myofibril
Q: T-Tubules
Answer:
run perpendicular to the sarcoplasmic reticulum and terminate in the vicinity of the z-line
between two vesicles
Q: action potential
Answer:
electrical nerve impulse
Q: 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
Q: troponin
Answer:
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