The alveoli are the final branchings of the respiratory tree and act as the primary gas exchange units of the lung.
The exchange of gases occurs at the ends of the airways in the lungs. Here tiny sacs called alveoli connect with tiny blood vessels and here exhaust gas [carbon dioxide] is exchanged for fresh gas [oxygen].
Tiny, delicate air sacs deep within the lungs, where the gas/blood exchange occurs.
lenticels
Gas exchange occurs in the alveoli of the lungs. These tiny air sacs are surrounded by capillaries where oxygen from the air can enter the bloodstream and carbon dioxide can be removed from the blood.
Alveoli is where gas exchange occurs.
Alveoli are tiny sacs in the lungs where the exchange of oxygen and carbon dioxide occurs during the process of respiration. They are surrounded by a network of blood vessels, allowing for efficient gas exchange to support bodily functions.
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The exchange of gases occurs at the ends of the airways in the lungs. Here tiny sacs called alveoli connect with tiny blood vessels and here exhaust gas [carbon dioxide] is exchanged for fresh gas [oxygen].
Gas exchange between the air and the blood occurs in the alveoli of the lungs. The alveoli are tiny air sacs where oxygen from the air diffuses into the blood and carbon dioxide from the blood diffuses into the air to be exhaled.
alveoli
alveolus (tiny air sacs arranged in clusters in the lungs, in which the exchange of oxygen and carbon dioxide takes place.)
The gas occurs by simple diffusion through the cells.