how does oxygen enters the blood in the luns explain?
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Oxygen enters the lungs, then passes through the alveoli and into the blood. The oxygen is carried around the body in blood vessels. Carbon dioxide moves into the blood capillaries and is brought to the lungs to be released into the air during exhalation.
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Oxygen-rich blood is then pumped through the aorta, the large artery that receives blood directly from the heart.
From the aorta, oxygen-rich blood travels to the smaller arteries and, finally, to the capillaries, the smallest type of blood vessel.
The oxygen molecules move, by diffusion, out of the capillaries and into the body cells.
While oxygen moves from the capillaries and into body cells, carbon dioxide moves from the cells into the capillaries.
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Carbon dioxide is brought, through the blood, back to the heart and then to the lungs. Then it is released into the air during exhalation.
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The oxygen enters the bloodstream from the alveoli, tiny sacs in the lungs where gasexchange takes place (Figure below). The transfer of oxygen into the blood is through simple diffusion.The oxygen-rich blood returns to the heart.Oxygen-rich blood is then pumped through the aorta, the large artery that receives blood directly from the heart.From the aorta, oxygen-rich blood travels to the smaller arteries and, finally, to the capillaries, the smallest type of blood vessel.The oxygen molecules move, by diffusion, out of the capillaries and into the body cells.While oxygen moves from the capillaries and into body cells, carbon dioxide moves from the cells into the capillaries.Carbon dioxide is brought, through the blood, back to the heart and then to the lungs. Then it is released into the air during exhalation.
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