First slide

Mechanism of Breathing

Question

The ratio of residual volume to functional residual capacity in a healthy human is about

Moderate

A

1:1
B

1:5
C

1:3
D

1:2

Solution

Functional residual capacity = expiratory reserve volume + residual volume = 1,000-1,100 + 1,100-1,200 = 2,100 to 2,300 mL ≈ 2,200 mL
Residual volume : expiratory reserve volume ≈ 1,100 mL : 2,200 mL = 1:2

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