Two air passages which allow air to enter the body are the cilia and aveoli !!!
The mouth and the nose is where air comes in.
Air enters through your nose or mouth to your air sacs.
Mouth and nose
Air can enter the body by the mouth or the nose. Air then goes down the windpipe to the lungs where it can enter the bloodstream.
the air enters the bronchioles, and into the aveoli, which are small, one cell-thick sacks of air. These sacks are surrounded by tiny capillaries, which is how your blood retrieves its oxygen. From here, the oxygenated blood is carried back to the heart through the pulmonary vein and pumped into your body.
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Light will bend towards the normal as it enters water from air, due to the change in speed of light when it moves from one medium to another with a different optical density.
Air enters the body through the nose or mouth and travels down the trachea. From there, it enters the bronchial tubes in the lungs, which branch into smaller airways called bronchioles. Finally, oxygen is exchanged with carbon dioxide in the alveoli, tiny air sacs in the lungs where oxygen is absorbed into the bloodstream.
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They all enter the lung ... but the only one that quickly enters the blood is oxygen. Because oxygen is the one gas that has a higher partial pressure in "lung air" than its partial pressure in the "lung blood". Note that the blood's CO2 pressure is higher than the air in the lungs, so CO2 comes out of the blood into the lung's air.
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