38. Myosin binds to: a. thin filaments. b. sarcoplasmic reticulum. c. z-lines. d

Question

38. Myosin binds to:

a. thin filaments.

b. sarcoplasmic reticulum.

c. z-lines.
d. troponin
e. a and d are correct.

39. A motor unit is composed of:
a. all of the muscle cells in a muscle.
b. a single muscle cell.
c. a lower motor neuron and a single muscle cell.
d. a lower motor neuron and all of the muscle cells that it innervates.

e. a lower motor neuron and all of the muscles that it innervates.

40. A motor unit becomes larger when there is an increase in the number of:

a. motor neurons that innervate a single muscle fiber.
b. sites that a motor neuron innervates along the length of a muscle cell.

c. muscle fibers that a motor neuron innervates.

d. motor neurons that innervate the entire muscle.

e. a and d are correct.

Explanation / Answer

38) (a) thin filaments [Actins]
39) (e) a lower motor neuron and all of the muscles that it innervates.
40) (a) motor neurons that innervates along the length of a muscle cell.

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