B3.1 Gas Exchange Flashcards

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1
Q

inspiration process

A

external intercostal muscles contract
ribcage moves up and out
diaphragm contracts and flattens
vol of thorax increases
pressure inside decreases
air is drawn in

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2
Q

expiration process

A

external intercostal muscles relax
ribcage moves down and in
diaphragm relaxes and becomes dome shaped
vol of thorax decreases
pressure inside thorax increases
air is forced out

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