Alveoli
Alveoli is where gas exchange occurs.
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The gas occurs by simple diffusion through the cells.
Respiration
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gas exchange occurs between the thin walls of the alveoli and the thin walls of the capillaries
The Gills
alveoli
Rattlesnakes have lungs and gas exchange occurs there.
Alveoli
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].
gaseous exchange takes place when the volume of the chest cavity is increased or decreased.