Describe the gas exchange between alveoli and capillaries?
Question: Describe the gas exchange between alveoli and capillaries?
The gas exchange between alveoli and capillaries is a process that allows oxygen to enter the bloodstream and carbon dioxide to exit. The alveoli are tiny air sacs in the lungs that are surrounded by capillaries, which are small blood vessels. The alveoli and capillaries have very thin walls that allow gases to diffuse across them. The partial pressure of oxygen is higher in the alveoli than in the capillaries, so oxygen moves from the alveoli to the blood. The partial pressure of carbon dioxide is higher in the capillaries than in the alveoli, so carbon dioxide moves from the blood to the alveoli. The oxygen binds to hemoglobin, a protein in red blood cells, and is carried to the tissues. The carbon dioxide is expelled from the lungs when we exhale.
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