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Which of the following muscles is NOT used in inhalation (breathing in)?
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Internal intercostals
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Diaphragm
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Scalenes
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Sternocleidomastoid
That's Correct!
It's Wrong!
The internal intercostals are not used in inhalation. During inhalation, the diaphragm contracts and moves downward, creating a vacuum that pulls air into the lungs. The scalenes and sternocleidomastoid muscles are accessory muscles that assist in inhalation by elevating the ribs and lifting the sternum, respectively. However, the internal intercostals are used during exhalation, as they help to depress the ribs and decrease the size of the thoracic cavity, forcing air out of the lungs.
