The capillary bed in the lungs is where the oxygen and carbon dioxide are exchanged.
Capillaries pick up carbon dioxide from the cells of the body and deliver oxygen.
Capillaries are the small blood vessels where oxygen is exchanged for carbon dioxide. They are located throughout the body and allow for the exchange of gases between the blood and tissues.
Every cell in your body has a capillary run by it. This capillary delivers nutrients and oxygen and removes waste and carbon dioxide.
Capillaries exchange food, oxygen, and carbon dioxide.
Oxygen is delivered to, and carbon dioxide is removed from, cells near the capillary.
Oxygen and carbon dioxide get into and out of cells via diffusion. The gases diffuse across the thin capillary wall, and then diffuse across the cell membrane.
Capillaries are the thin-walled vessels that allow oxygen and carbon dioxide exchange. Their thin walls make it easy for gases to diffuse across the membranes.
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oxygen and carbon dioxide are exchanged in alveoli (singular alveolus).
Capillaries cover the alveoli in order to maximize the area for gas exchange between the lungs and the blood. Carbon dioxide is released from the blood through the capillary walls and into the alveoli, while oxygen is picked up from the alveoli through the capillary walls and into the blood.
Oxygen diffuses from the alveoli into the capillaries, where it binds to hemoglobin in red blood cells for transport to tissues. Carbon dioxide diffuses from the capillaries into the alveoli and is exhaled from the body.
The answer you are looking for is most likely a "capillary". "Capillaries are the smallest of a body's blood vessels...which connect aterioles and venules, and enable the interchange of water, oxygen, and carbon dioxide, and many other nutrient and waste chemical substances between blood and surrounding tissues."