If one of the sternocleidomastoid muscles contracts,it causes a different movement than if both of them contract.

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Quizplus · Accepted Answer

The sternocleidomastoid muscles are located on either side of the neck and are responsible for rotating the head and flexing the neck. When one muscle contracts, it causes the head to rotate to the opposite side, whereas when both muscles contract, they flex the neck forward. Therefore, the movement caused by one muscle contracting is different from the movement caused by both muscles contracting.

If One of the Sternocleidomastoid Muscles Contracts,it Causes a Different