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Q.

The tidal volume is 450 mL, inspiratory capacity is 3,450 mL and expiratory capacity is 1,450 mL in a man. What is his vital capacity? 

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a

4,450 mL

b

4,900 mL 

c

4,550 mL 

d

4,000 mL

answer is A.

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Detailed Solution

IC = TV + IRV

IRV = IC – TV

= 3450 – 450 = 3,000

Vital capacity = IRV + TV + ERV 

= IRV + EC = 3,000 + 1,450 = 4,450 mL

Alternative Method:

      ERV = EC – TV

      = 1450 – 450 = 1,000

      Vital capacity = IRV + TV + ERV 

      = IC + ERV = 3,450 + 1,000 = 4,450 mL

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