When the quadriceps contract, what also must happen at the same time? . a. The gastrocnemius must contract.. b. The gastrocnemiu
s must relax.. c. The hamstrings must contract.. d. The hamstrings must relax.
2 answers:
Answer:
The anwser is D
Explanation:
Hamstrings must relax
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When the quadriceps contract his opposing muscle must relax, so, the hamstrings must relax. Letter d)
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