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Anonymous
gaseous exchange takes place when the volume of the chest cavity is increased or decreased.
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Clearly, the answer to your question is in the question, people exchange their gas.
Alveoli is where gas exchange occurs.
Tiny, delicate air sacs deep within the lungs, where the gas/blood exchange occurs.
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The gas occurs by simple diffusion through the cells.
Alveoli
Respiration
The actual sites of gas exchange within the lungs are the alvioli.
The alveoli are small sacs within the lungs where gas exchange occurs. They are located at the ends of bronchiole branches.
gas exchange occurs between the thin walls of the alveoli and the thin walls of the capillaries
The Gills
alveoli