In skeletal muscle pairs, when one muscle contracts, what happens to its partner?

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Study for the Muscular System and Skeletal System Exam. Learn with flashcards and multiple choice questions, where each question has explanations and hints. Be well-prepared and confident on your test day!

Multiple Choice

In skeletal muscle pairs, when one muscle contracts, what happens to its partner?

Explanation:
Muscles that move a joint work in opposing pairs. When one muscle (the agonist) contracts to produce a movement, its partner (the antagonist) must relax so the joint can move freely. This relaxation is controlled by reciprocal inhibition in the nervous system. For example, when you bend your elbow, the biceps contract while the triceps relaxes, allowing the forearm to lift. The partner isn’t inactive; it lengthens as it relaxes to let the motion occur. So the partner relaxes.

Muscles that move a joint work in opposing pairs. When one muscle (the agonist) contracts to produce a movement, its partner (the antagonist) must relax so the joint can move freely. This relaxation is controlled by reciprocal inhibition in the nervous system. For example, when you bend your elbow, the biceps contract while the triceps relaxes, allowing the forearm to lift. The partner isn’t inactive; it lengthens as it relaxes to let the motion occur. So the partner relaxes.

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