Question

During which of the following actions do the muscles in our body expand and contract?

Answer 1

Explanation:

When a muscle fiber gets a signal from its nerve, proteins and chemicals release energy to either contract the muscle or relax it. When the muscle contracts, this pulls the bones it's connected to closer together. Many of our muscles come in pairs. An example of this is the biceps and triceps in our arms.

Answer 2

Answer:

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