Multiple choice general knowledge science & technology

Exhaled air has what % of its oxygen left?

  1. 77%

  2. 26%

  3. 48%

  4. None
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When breathing out, the body does not extract all oxygen from inhaled air. About 16% oxygen remains in exhaled air since humans only absorb about 4-5% of the oxygen they inhale. The options seem confused - if this meant 77% of original oxygen (21% in air), that would be about 16% remaining.

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