When muscles are at rest, Select one: O a. the thin and thick filaments are shor

Question

When muscles are at rest, Select one: O a. the thin and thick filaments are shorter than in a contracted muscle. b. tropomyosin is situated on the myosin filament, preventing actin heads from binding. O c. the length of each sarcomere is shorter than in a contracted muscle. O d. tropomyosin is situated on the actin filament, preventing myosin heads from binding. During muscle contraction, the function of the T tubules is to Select one: a. store Ca2+ and release it when stimulated by an action potential. O b. shorten the sarcomeres. O c. slide troponin and tropomyosin past one another. Od. transmit the action potential deeply into the muscle cells. The location where the motor nerve impulse is transmitted from nerve endings to skeletal muscle cell membranes is the Select one: O a. myosin binding site O b. sarcoplasmic reticulum c. sarcomere O d. neuromuscular junction

Explanation / Answer

1.d)tropomysin is situated on the actin filament, preventing myosin heads from binding

2.d)transmit the action potential deeply into the muscle cells

3.d)neuromuscular junction

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