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Q.

Inspiratory capacity (IC) and functional residual capacity (FRC) of a person are 3500 mL and 2200 mL respectively. What will be his vital capacity (VC) if the residual volume (RV) is 1200 mL?

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a

4500 mL

b

3700 mL

c

5200 mL

d

5700 mL

answer is A.

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Detailed Solution

IC = TV+IRV = 3500mL
FRC = RV+ERV= 2200mL, ERV = FRC-RV
Since,
RV=1200mL, ERV=2200-1200 = 1000mL
VC = TV+IRV+ERV = 3500+1000 = 4500mL

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