Question

Oxygen or Carbon Dioxide is the main funtion for gas exchange in what? Capillaries or Alveoli?

Oxygen or Carbon Dioxide is the main funtion for gas exchange in what? Capillaries or Alveoli?

Homework Answers

Answer #1

Inhaled oxygen enters the lungs and reaches the alveoli. The layers of cells lining the alveoli and the surrounding capillaries are each only one cell thick and are in very close contact with each other. This barrier between air and blood averages about 1 micron (1/10,000 of a centimeter, or 0.000039 inch) in thickness. Oxygen passes quickly through this air-blood barrier into the blood in the capillaries. Similarly, carbon dioxide passes from the blood into the alveoli and is then exhaled.

Therefore gas exchange (oxygen or CO2) takes place in ALVEOLI.

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