Why does oxygen move from the alveoli to the blood?
Answers: The partial pressure of oxygen in the blood is smaller quantity than the partial pressure in the atmosphere (which is pretty close to that within your lungs when you breathe in). Therefore, there's a gradient, so oxygen moves along that angle into the blood.
Similarly carbon dioxide moves out of the blood into the lungs along its gradient.
From an nouns of high concentration to an nouns of low concentration.
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