18th November 2019

medlineplus
16

Where gas exchange takes place in the lungs?

Gas exchange is the delivery of oxygen from the lungs to the bloodstream, and the elimination of carbon dioxide from the bloodstream to the lungs. It occurs in the lungs between the alveoli and a network of tiny blood vessels called capillaries, which are located in the walls of the alveoli.

Subsequently, one may also ask, how is diffusion used in the respiratory system?

When blood returns to your lungs from the body, it has a lot of carbon dioxide and no oxygen. The carbon dioxide concentration is much greater in your blood than the alveoli. So, by the rule of diffusion, the carbon dioxide moves from the blood to the alveoli, where it can be exhaled through the lungs.

How does gas exchange take place in the alveoli?

The function of the respiratory system is to exchange two gases: oxygen and carbon dioxide. As shown below, inhaled oxygen moves from the alveoli to the blood in the capillaries, and carbon dioxide moves from the blood in the capillaries to the air in the alveoli.

How do gases move across the membrane?

In summary, gas exchange is the movement of oxygen into the blood and carbon dioxide out of the blood across the respiratory membrane in the lungs. Gas exchange occurs across this membrane and is diffusion of oxygen into and carbon dioxide out of the blood.
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