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When the quadriceps contract, what also must happen at the same time? . a. The gastrocnemius must contract.. b. The gastrocnemius must relax.. c. The hamstrings must contract.. d. The hamstrings must relax.

Verified Answer :

ferrettiusa

Hello!

When the quadriceps contract his opposing muscle must relax, so, the hamstrings must relax. Letter d)

Hugs!

rushraven

Answer:

The anwser is D

Explanation:

Hamstrings must relax

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