HUMAN PHYSIOLOGY
BREATHING AND RESPIRATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Water
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Carbon dioxide
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Oxygen
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Carbon monoxide
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Detailed explanation-1: -The body needs oxygen for energy. It gets this oxygen from the air around you. When you breathe in through your nose or mouth, you pull air into your throat and down the windpipe.
Detailed explanation-2: -Signals from the respiratory centre in your brain travel down nerves to your diaphragm and other muscles. The diaphragm is pulled flat, pushing out the lower ribcage and abdomen. At the same time, the muscles between your ribs pull your rib cage up and out. This expands the chest and draws air into the lungs.
Detailed explanation-3: -The human breathing mechanism actual revolves around CO2, not oxygen. Without carbon dioxide, humans wouldn’t be able to breathe.
Detailed explanation-4: -Three vital respiratory gases-oxygen (O(2)), nitric oxide (NO), and carbon dioxide (CO(2))-intersect at the level of the human red blood cell (RBC).