What happens to the diaphragm when a person breathes in or inhales? *
A. contracts
B. expands
C. hardens
D. extends
A. contracts
B. expands
C. hardens
D. extends
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Answer:
A.Contacts
Explanation:
Upon inhalation, the diaphragm contracts and flattens and the chest cavity enlarges. This contraction creates a vacuum, which pulls air into the lungs. Upon exhalation, the diaphragm relaxes and returns to its domelike shape, and air is forced out of the lungs.
ANSWER
What happens to the diaphragm when a person breathes in or inhales?
A. contracts
Why I pick letter A?
Because, when we inhale or breathe in, the diaphragm contracts and pulls downward. This movement increases the space in the lungs, which pulls air into it.
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