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? contracts relaxes both contracts and relaxes neither contracts nor relaxes
Answer
Brief Explanations:
Muscles work in antagonistic pairs. When one muscle contracts to move a body - part, the opposing muscle relaxes to allow the movement. To raise an arm upward, the flexor muscle contracts and the extensor muscle (on the opposite side) relaxes.
Answer:
B. relaxes