How Does Oxygen Enter the Bloodstream?

Answer

Oxygen enters the bloodstream through the air we breathe. First it goes to the lungs where it is absorbed by capillaries. From there it enters the bloodstream.
Q&A Related to "How Does Oxygen Enter the Bloodstream?"
Alveoli (air sacs) are very thin walled to reduce the distance that oxygen in the alveoli or carbon dioxide in the blood has to diffuse. They are also very richly vascularized with
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Blood becomes oxygenated in the lungs. Carbon
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D is the answer. Diffusion is the passive movement of molecules or particles(oxygen) along a concentration gradient, or from regions of higher to regions of lower concentration. Facilitated
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