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Question

A patient has a Functional Residual capacity (FRC) of 3 liters, tidal volume (TV) of 650 milliliters, expiratory reserve volume (ERV) of 1.5 liters, total lung capacity (TLC) of 8 liters and respiratory rate of 15 breaths/ min. What is the residual volume (RV)?
 


A
500 ml 
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B
1000 ml 
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C
 1500 ml 
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D
 2000 ml 
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Solution

The correct option is C  1500 ml 
Residual Volume (RV): Volume of air remaining in the lungs even after a forcible expiration.

RV = FRC − ERV
      = 3 L − 1.5 L 
      = 1.5 L
      = 1500 ml.
 

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