The capillaries surrounding the alveoli at the ends of the bronchioles in the lungs.
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The alveoli are the structures in the respiratory system responsible for the exchange of oxygen and carbon dioxide. They are located in the lungs and have a thin membrane that allows for gases to be exchanged with the blood vessels.
The respiratory system exchanges oxygen by inhaling air through the nose or mouth, where oxygen is taken into the lungs and absorbed into the bloodstream. Carbon dioxide, a waste product, is then expelled by exhaling air out of the lungs. This exchange occurs in the alveoli, tiny air sacs in the lungs where the transfer of gases takes place.
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Oxygen and carbon dioxide are the two important gases that diffuse across the respiratory membrane. Oxygen moves from the alveoli into the bloodstream, while carbon dioxide moves from the bloodstream into the alveoli to be exhaled.
The respiratory system is responsible for taking in oxygen through the process of breathing and releasing carbon dioxide as waste. This exchange of gases occurs in the lungs, where oxygen is absorbed into the bloodstream and carbon dioxide is expelled from the body.
The respiratory system exchanges gases between air and blood. This process occurs in the lungs, where oxygen is taken in from the air and carbon dioxide is released from the blood into the air.