ENDOCRINE ORGANS AND RESPIRATORY SYSTEM
RESPIRATORY SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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oxygen
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Carbon dioxide
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lungs
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None of the above
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Detailed explanation-1: -Carbon dioxide diffuses into the lungs and is expelled as we exhale. While the deoxygenated blood travels in the veins, detectors in the brain and blood vessels (chemoreceptors) measure the blood’s pH.
Detailed explanation-2: -Exhalation: When you breathe out, or exhale, your diaphragm relaxes and moves up into your chest cavity. As the space in your chest cavity gets smaller, air rich in carbon dioxide is forced out of your lungs and windpipe, and then out your nose or mouth.
Detailed explanation-3: -The average human exhales about 2.3 pounds of carbon dioxide on an average day. (The exact quantity depends on your activity level-a person engaged in vigorous exercise produces up to eight times as much CO2 as his sedentary brethren.)