External Respiration is where gasses are absorbed into the blood through the alveolar capillary beds.
Internal respiration is where the gasses are transferred into the cells from the blood.
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Alveoli is where gas exchange occurs.
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The gas occurs by simple diffusion through the cells.
Respiration
Alveoli
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].