The masseter muscles originate on your cheekbones and insert into the posterior corners of the mandible (the lower jaw bone) underneath your ears. Will contraction of the masseter muscles open or close your jaw?
A. open
B. close
B. close
Clarify Question
· What is the key concept addressed by the question?
o The question asks about how muscles move a hinge joint like the jaw.
· What type of thinking is required?
o You are being asked to apply your knowledge about how muscles move a hinge joint like the jaw.
Gather Content
· What do you know about how muscles move a hinge joint like the jaw? What other information is related to the question?
o Skeletal muscles produce movement of the skeleton when they contract. Usually, the two ends of a skeletal muscle are attached to different bones, although some may be attached to other structures, such as skin. The masseter is connected to two bones that are joined together by a hinge joint, the cheek bone and jaw bone. When the masseter contracts it generates force by pulling the two bones closer together. This causes bending to occur at the joint, thereby closing the jaw.
Choose Answer
· Given what you now know, what information is most likely to produce the correct answer?
o When the masseter contracts, the jaw will close. You can feel the masseter contract when you close your jaw and clench your molars.
Reflect on Process
· Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
o This question asked you to apply your knowledge about how muscles move a hinge joint like the jaw. If you got the correct answer, great job! If you got an incorrect answer, where did the process break down? Did you think that when muscles contract they expand? Did you think that the muscles were oriented so they would push the two bones apart?
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