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Elis [28]
3 years ago
7

The two basic and opposite actions that account for all muscle movements are contraction and extension.

Biology
1 answer:
Alekssandra [29.7K]3 years ago
3 0
False
Muscles are only able to contract or relax. This is why they need complementary muscles. For example, the bicep can raise the forearm, but cannot lower it. For that, the tricep is needed.
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Explanation:

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