Hbvnnv
Alveoli is where gas exchange occurs.
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The gas occurs by simple diffusion through the cells.
Respiration
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Capillary system is where gas exchange occurs
gas exchange occurs between pulmonary capillaries and the alveoli in the lungs.
gas exchange occurs between the thin walls of the alveoli and the thin walls of the capillaries
alveoli
The Gills
Rattlesnakes have lungs and gas exchange occurs there.
Alveoli