Question

in whole - muscle contractions, the role of the ____ is to stimulate contractions in different sets of motor units at different moments to cause smooth movements.
o myosin heads
o spinal cord
o epimysium
o muscle fibers
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Explanation:

Myosin heads are involved in muscle - fiber contraction at a molecular level. Epimysium is a connective - tissue layer around the muscle. Muscle fibers are the individual cells of muscle. The spinal cord is responsible for sending neural signals to stimulate contractions in different sets of motor units at different times for smooth movements.

Answer:

spinal cord