When a skeletal muscle is contracting, another skeletal muscle is relaxing. this illustrates the concept of___.

a. antagonistic motor neurons

b. reciprocal muscle

c. antagonistic muscles

d. reciprocal innervation?

Answer: Antagonistic muscles

Antagonistic muscles are muscles that usually provides opposite of the agonist movement by opposing joint torque to the agonist muscles. Thus, antagonist muscles slow down or control movement opposite to their agonist partner while in some other situation a muscle can be antagonist throughout a particular movement.