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nataly862011 [7]
3 years ago
10

Why do muscles pull but not push

Biology
2 answers:
lorasvet [3.4K]3 years ago
4 0

Explanation:

Muscles can pull bones, but they can't push them back to the original position. So they work in pairs of flexors and extensors. The flexor contracts to bend a limb at a joint. Then, when the movement is completed, the flexor relaxes and the extensor contracts to extend or straighten the limb at the same joint.

Leviafan [203]3 years ago
4 0

Answer:

the muscles are designed to only contract

Explanation:

the muscles would not be able to pull if the two protein molecules are not present.

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I hope this could help you! ^^
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