During external respiration, are gases exchanged between the outside air and the alveoli, the alveoli and the blood, the blood and cells, the outside air and blood in the dermis, or the cytosol and mitochondria?

Md Ariful Islam

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External respiration is the exchange of gases between the external environment and a distributing system of the animal body, between the $color(red)"alveoli"$ of the lungs and the $color(red)"blood"$.

Internal respiration is the exchange of gases (as oxygen and carbon dioxide) between the $color(red)"cells"$ of the body and the $color(red)"blood"$.

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