2006-11-28 14:00:10 · 7 answers · asked by Lupita 3 in Science & Mathematics ➔ Biology
To allow positive and negative motion so that you can bend the elbow or the leg. Gotta have one to push and one to pull it back.
2006-11-28 14:02:31 · answer #1 · answered by Justcurious 3 · 0⤊ 0⤋
They are not arranged in pairs, but there are groups of muscles with opposing actions that help stabilize a joint and allow movement in more than one direction.
2006-11-28 14:09:46 · answer #2 · answered by picopico 5 · 0⤊ 0⤋
Muscles are designed to contract for movement. They do not expand but rather they relax. When they relax, the oposing muscle contracts to return limb to position.
2006-11-28 14:03:51 · answer #3 · answered by FRANKFUSS 6 · 0⤊ 0⤋
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2006-11-28 14:37:38 · answer #4 · answered by mse p 1 · 0⤊ 0⤋
when one muscle contracts another must extend (or expand), so they're arranged in pairs.
2006-11-28 14:02:59 · answer #5 · answered by Jason B 2 · 0⤊ 0⤋
Your arms and legs work almost like a fulcrum.
2006-11-28 14:07:44 · answer #6 · answered by Chuck Dhue 4 · 0⤊ 0⤋
i makes the body even.
2006-11-28 14:05:27 · answer #7 · answered by Anonymous · 0⤊ 0⤋