Question

Tidal Volume and Expiratory Reserve Volume of an athlete is 500 mL and 1000 mL respectively. What will be his Expiratory Capacity if the Residual Volume is 1200 mL?

• A. 1500 mL
• B. 1700 mL
• C. 2200 mL
• D. 2700 mL

Answer 1

The Correct Option is A

To determine the Expiratory Capacity (EC) of the athlete, we need to understand the relevant respiratory volumes:

• Tidal Volume (TV): This is the volume of air inspired or expired in a single breath under resting conditions. Given as 500 mL.
• Expiratory Reserve Volume (ERV): This is the additional volume of air that can be forcefully exhaled after the end of a normal expiration. Given as 1000 mL.
• Residual Volume (RV): This is the volume of air remaining in the lungs after a maximal exhalation. Given as 1200 mL.

The Expiratory Capacity (EC) can be calculated using the formula:

EC = TV + ERV

Substituting the given values:

EC = 500 \, \text{mL (TV)} + 1000 \, \text{mL (ERV)} = 1500 \, \text{mL}

Thus, the Expiratory Capacity of the athlete is 1500 mL.

Let's analyze why the other options do not match:

• 1700 mL: This sum would occur if there were additional lung volumes included, but only TV and ERV are considered for EC.
• 2200 mL: This value is likely considering additional incorrectly calculated lung volumes, beyond EC.
• 2700 mL: This could be mistaken for a total lung capacity with incorrect components, but for EC, only TV and ERV are relevant.