from the aveolus
capillaries
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Oxygen is in the air, and when you breathe in the oxygen gets into your lungs and is absorbed into the red blood cells.
Oxygen enters the body by being absorbed into the blood (specifically, it is absorbed by red blood cells which contain an oxygen-carrying compound known as hemoglobin) when air is inhaled into the lungs, which have a highly porous, spongy structure which facilitates the exposure of blood to the air.
While breathing only oxygen is absorbed, because hemaglobin in red blood cells selectively absorbs oxygen and not other gases.
The oxygen in the air you breathe in is absorbed via the lungs into the blood.
Here the main function is of lungs and blood vessels.When we breathe oxygen from atmosphere get into our lungs and is absorbed into blood vessels in our lungs and these blood vessels transport oxygen to our toes from where carbon dioxide is absorbed into blood vessels and oxygen is provided to the tissues and this process goes on.
Oxygen is absorbed, and Carbon Dioxide is released.
In lungs where carbon dioxide is released and oxygen absorbed and in cells where oxygen is given to cells and carbon dioxide is absorbed by blood.
Oxygen after inhalation is absorbed by hemoglobin of blood in the lungs and from there it is distributed in the entire body through blood streams.
You have about 20% oxygen in inhaled air and negligible carbon bi oxide. You have about 4% carbon bi oxide in the exhaled air. That means 4% of the oxygen is absorbed from the blood. That makes it 4%/20%= 20% of the oxygen from the inhaled air is absorbed in your blood.
The capillaries of the lungs become clogged.