Which structure in the diagram below is a muscle that contracts during

inhalation?

Larynx

D

Pharynx

C

Lung

B

А

Lung

Explanation:

Lungs expand to pull oxygen into the body and contract to push it back out. The larynx is known as the voice box which is an air way passage to the lungs and a pharanx is membrane lined cavity behind the nose and mouth. Neither of these really expand or contact during inhalation so the answer is Lungs.