explain passage of air in humans
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In humans,oxygen is very important for survival.Human inhale the O2 gas by there nostrils.The O2 travel from our nostrils to the lungs.Lungs have special vessels have bronchi at the end which expand during inhalation and contract while exhalation.The O2 passes from the heart to travels our whole body by blood vessels.After travelling whole body it come back to our heart through capillaries in the form of CO2.Then the CO2 get exhale by our nostrils.
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Air enters the body and is warmed as it travels through the mouth and nose. The trachea divides into two bronchi. One bronchus enters each lung. ... At the end of the bronchioles, the air enters one of the many millions of alveoli where gaseous exchange takes place.
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