Exhaled air contains _____% oxygen?

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Multiple Choice

Exhaled air contains _____% oxygen?

Explanation:
Oxygen content in exhaled air reflects what's been used by the body's cells during gas exchange. In the lungs, oxygen diffuses into the blood and the body's tissues consume it for metabolism, so the air you exhale has less oxygen than the air you inhaled. Normal room air contains about 21% oxygen, but after gas exchange, exhaled air typically has around 16% oxygen because oxygen has been taken up by the blood and tissues. The other options either represent inhaled air or values that are less representative of typical physiological gas exchange. Therefore, the best answer is about 16%.

Oxygen content in exhaled air reflects what's been used by the body's cells during gas exchange. In the lungs, oxygen diffuses into the blood and the body's tissues consume it for metabolism, so the air you exhale has less oxygen than the air you inhaled. Normal room air contains about 21% oxygen, but after gas exchange, exhaled air typically has around 16% oxygen because oxygen has been taken up by the blood and tissues. The other options either represent inhaled air or values that are less representative of typical physiological gas exchange. Therefore, the best answer is about 16%.

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