Question

what phase includes these events? (1) cytoplasmic calcium levels fall; (2) myosin releases thin filaments; (3) muscle tension declines.
relaxation
contraction
excitation - contraction coupling
excitation
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Explanation:

During muscle relaxation, cytoplasmic calcium levels drop as calcium is pumped back into the sarcoplasmic reticulum. Myosin releases the thin - actin filaments, and muscle tension decreases. In contraction, myosin binds to actin and generates tension. Excitation - contraction coupling is the process that links the electrical excitation of a muscle fiber to its contraction. Excitation refers to the generation of an action potential in the muscle fiber.

Answer:

A. Relaxation