Question

(3.2.b) breathing emergencies: quiz
about what percentage of the air you breathe into your lungs is actually used by your body to function normally?
10%
5%
21%
16%

Explanation:

Air we breathe contains oxygen. The body extracts a portion for normal - functioning. The typical percentage of oxygen used from the inhaled air is around 16%. The air we inhale has about 21% oxygen and the air we exhale has about 16% oxygen, indicating that about 5% of the oxygen is used by the body for normal metabolic processes. But in terms of the percentage of the inhaled air used overall for normal body function, it is about 16%.

Answer:

D. 16%