The 500 mL of air that is inspired is the same 500 mL of air that enters the alveoli during a single breath.

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The 500 mL of air that is inspired is not the same 500 mL of air that enters the alveoli during a single breath. Some of the air remains in the conducting airways and does not reach the alveoli for gas exchange. This is known as anatomical dead space. The actual amount of air that reaches the alveoli for gas exchange is referred to as the alveolar ventilation.

The 500 ML of Air That Is Inspired Is the Same