What is the approximate percentage of oxygen in expired air?
A.
\(0.04 \%\)
B.
\(4 \%\)
C.
\(16 \%\)
D.
\(21 \%\)
Exam No：0610_w22_qp_22 Year：2022 Question No：20
Answer:
C
Knowledge points:
11.1.3 State the differences in composition between inspired and expired air, limited to oxygen, carbon dioxide and water vapour Use limewater as a test for carbon dioxide to investigate the differences in composition between inspired and expired air
Solution:
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