EMBRYOLOGY
RESPIRATORY SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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When we breathe out, the ____ leaves our lungs.
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Carbon dioxide
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Oxygen
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Either A or B
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None of the above
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Explanation:
Detailed explanation-1: -Carbon dioxide (CO2) is a waste product of cellular metabolism. You get rid of it when you breathe out (exhale). This gas is transported in the opposite direction to oxygen: It passes from the bloodstream – across the lining of the air sacs – into the lungs and out into the open.
Detailed explanation-2: -Your diaphragm tightens and flattens, allowing you to suck air into your lungs. To breathe out (exhale), your diaphragm and rib cage muscles relax. This naturally lets the air out of your lungs. To get the oxygen your body needs, you inhale air through your mouth and nose.
There is 1 question to complete.