In an average adult, only about 1/3 of the air inhaled actually reaches the alveoli.

Name: In an average adult, only about 1/3 of the air inhaled actually reaches the alveoli.
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In an average adult, most of the air inhaled (about 70%) reaches the alveoli, where gas exchange occurs. The rest remains in the conducting airways (trachea, bronchi) and is referred to as dead space.

In an Average Adult, Only About 1/3 of the Air