What is external respiration?
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The first step of respiration in which external air is drawn inside the body via breathing so that oxygen is reached into the lungs. The used air that is carbon-dioxide is then released finally from the lungs.
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Explanation:
External respiration :-
- The exchange of respiratory gases between the blood and alveolar air at the respiratory surface is called external respiration.
- During the breathing cycle, when air is taken in and out of the body, the lungs always contain a residual volume of air so that there is sufficient time for oxygen to be absorbed and for the carbon dioxide to be released.
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