what happened when diaphragm contracts and flattens
a) air is forced out of lungs
b) volume of thoracic cavity increases
c) the ribcage moves downwards inwards
d) air pressure in lungs increases
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Answer:
(a)
Explanation:
Upon exhalation, the diaphragm relaxes and returns to its domelike shape, and air is forced out of the lungs.
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