Answered

While the muscles on the front of your arm contract or shorten to raise your forearm, what happens to the muscles on the back of your arm?

A. They are flooded with chemicals that cause movement.
B. They receive a message to tighten and contract.
C. They receive a message to relax and stretch.
D. Nothing happens to the muscles on the back of your arm.



Answer :

GinnyAnswer

Final answer:

When the front muscles contract, the back muscles relax to allow for movement.


Explanation:

When the muscles on the front of your arm contract to raise your forearm, the muscles on the back of your arm, specifically the triceps brachii muscle, receive a message to relax and stretch. This is because the triceps brachii acts as the antagonist to the biceps brachii, causing the extension of the forearm as it contracts, undoing the flexing brought about by the biceps brachii.

When the triceps brachii contracts, the biceps brachii and its synergists must be relaxed, and vice versa, to allow for coordinated movement in the arm.


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