In mammals,gas exchange between the air and blood takes place across the walls of the:

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In mammals, gas exchange between the air and blood takes place in the alveoli. Alveoli are tiny air sacs located at the ends of the bronchioles in the lungs. The walls of the alveoli are thin and contain numerous blood vessels called capillaries, where gas exchange occurs. Oxygen from the air diffuses across the alveolar wall and into the capillaries, while carbon dioxide from the blood diffuses back into the lungs to be exhaled.

In Mammals,gas Exchange Between the Air and Blood Takes Place