Ventilation involves the exchange of gases between the atmosphere and the lungs, external respiration occurs between the alveoli and the blood, and internal respiration involves the exchange of gases between the blood and cells of the body.
Ventilation: Exchange of gases between the atmosphere and the lungs.
External respiration: Exchange of gases between the alveoli and the blood.
Internal respiration: Exchange of gases between the blood and cells of the body.
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