in the process if inhalation, what happens to the air pressure in the chest cavity?
a. it decreases and the rib muscles and the diapragn contract
b. it increases and the rib muscle and the diapragm contract
c. it decreases and the rib muscle and the diapragm realx
d. it increases and the rib muscle and the diapragm relax
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Answer:
b.it increases and the rib muscle and the diapragm contract
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