The temporalis and masseter muscles close the jaw while the platysma opens the jaw.To clench your teeth,which of the following must occur?

Question

Quizplus · Accepted Answer

To clench the teeth, we need to close the jaw, which is done by the temporalis and masseter muscles. The platysma muscle is not involved in this action and needs to be relaxed. Therefore, to clench the teeth, the temporalis and masseter muscles should contract, and the platysma muscle should be relaxed. Choice A is the only option that describes this combination of muscle actions.

The Temporalis and Masseter Muscles Close the Jaw While the Platysma