Value of functional residual capacity is -a)2100-2300 ml b)2200-2500mlc)2000-2100 ml d)below 2000mlCorrect answer is option 'A'. Can you explain this answer?

Question

Answer

Functional residual capacity(FRC): volume of the air that will remain in the lungs after a normal expiration this includes expiratory reserve volume ( ERV) + residual volume(RV). ERV = 1000 ml to 1100 ml.
RV = 1100 ml to 1200ml.==> 2100 to 2300.

Answer

Functional residual capacity(FRC): volume of the air that will remain in the lungs after a normal expiration this includes expiratory reserve volume ( ERV) + residual volume(RV). ERV = 1000 ml to 1100 ml.
RV = 1100 ml to 1200ml.==> 2100 to 2300.

Answer

FRC (functional residual volume) includes ERV+RV .....RV=1100-1200....ERV=1000-1100....on adding RV and ERV,we get:-FRC=2100-2300...(just refer ncert).....

Answer

Functional residual capacity (FRC) is the volume of air that remains in the lungs after a normal exhalation. It is the sum of expiratory reserve volume (ERV) and residual volume (RV). FRC represents the volume of air in the lungs at the end of a normal passive expiration, when the respiratory muscles are relaxed.

The correct answer to the question is option 'A' (2100-2300 ml) because the typical range for FRC in healthy adults is approximately 2100-2300 ml.

Explanation:

1. Functional Residual Capacity (FRC):
- FRC is the volume of air that remains in the lungs after a normal exhalation.
- It is a key parameter in lung function testing and represents the balance between the tendency of the lungs to collapse and the tendency of the chest wall to expand.
- FRC is determined by the opposing forces of lung elastic recoil and chest wall compliance.

2. Components of FRC:
- Expiratory Reserve Volume (ERV): This is the volume of air that can be forcibly exhaled after a normal exhalation. It is approximately 1200 ml.
- Residual Volume (RV): This is the volume of air that remains in the lungs after a maximal exhalation. It is approximately 1200 ml.

3. Calculation of FRC:
- FRC = ERV + RV
- Therefore, FRC is the sum of ERV and RV.

4. Normal range of FRC:
- In healthy adults, the typical range for FRC is approximately 2100-2300 ml.
- However, FRC can vary depending on factors such as age, sex, height, and body position.

5. Importance of FRC:
- FRC plays a crucial role in maintaining adequate gas exchange in the lungs.
- It ensures that the airways remain open and prevents collapse of the alveoli during normal breathing.
- FRC also provides a reservoir of air for gas exchange during periods of increased oxygen demand, such as exercise.

In summary, the correct answer to the question is option 'A' (2100-2300 ml) because this range represents the typical values for functional residual capacity in healthy adults. FRC is an important parameter in lung function testing and ensures the maintenance of adequate gas exchange in the lungs.

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