Why are at least two muscles needed to move a bone at a joint in one direction?

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Solution

Muscles can contract and pull on the bones, but they cannot push. Therefore, at least two muscles are needed. When one contracts, the other extends and vice-versa to allow movement at a joint.

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Similar questions

Statement 1: Bones can move themselves

Statement 2: Bones need muscles and joints for movement

Question 6

How many muscles work together to move a bone?
(a) One
(b) Two
(c) Three
(d) Four

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