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Which of the following statements best summarizes excitation-contraction coupling?

a. A series of events in which an action potential triggers the release of chemical messengers.
b. A series of events in which calcium gradients are used to convey a signal to the muscle fiber to enact contraction.
c. A series of events in which an electrical stimulus is conveyed to a muscle fiber to enact contraction.
d. A series of events in which actin binds myosin to enact contraction.

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Answer:

C. A series of events in which an electrical stimulues is conveyed to a muscle fiber to enact contraction.

Explanation:

The excitation-contraction coupling is the physiological process that converts an electrical stimulus to a mechanical response; it is the action potential generated in the sarcolemma and the start of a muscle contraction. Electrical signals called action potentials travel through the neuron's axon, which branches through the muscle and connects individuals fibers at a neuromuscular junction.

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