to raise an arm upward, the muscle on one side of it contracts. what happens to the muscle on the opposite…

to raise an arm upward, the muscle on one side of it contracts. what happens to the muscle on the opposite side of the arm?\ncontracts\nrelaxes\nboth contracts and relaxes\nneither contracts nor relaxes

to raise an arm upward, the muscle on one side of it contracts. what happens to the muscle on the opposite side of the arm?\ncontracts\nrelaxes\nboth contracts and relaxes\nneither contracts nor relaxes

Answer

Brief Explanation:

Muscles work in antagonistic pairs. When one muscle contracts to move a body - part, the opposing muscle relaxes to allow the movement. When raising an arm upward, the muscle on one side contracts and the muscle on the opposite side relaxes.

Answer:

B. relaxes