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Question

Write short notes on:
Respiratory volumes

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Solution

Short note on respiratory volumes:
1. Tidal Volume (TV) - The amount of air expired/inspired during one breath is termed as tidal volume. It is 500 ml in human beings.
2. Inspiratory Reserve Volume (IRV] - The amount of air inspired over and above the normal inspiration. It is 2500 to 3000 ml in human beings.
3. Expiratory Reserve Volume [ERV] - The amount of air expired over and above the normal expiration. It is 1000 to 1100 ml in human beings.
4. Residual air (RV) - It is the amount of air left in both the lungs after forced expiration. It is about 1100 to 1500 ml in human beings.
5. Inspiratory Capacity (IC) - The maximum inspired air is called as IC. It includes tidal volume and IRV. It is about 3500 ml in human beings.
6. Expiratory Capacity (EC) - The maximum expired air is called as EC. It includes TV + ERV. It is about 1500 to 1600 ml. in human beings.
7. Functional Residual Capacity (FRC) - The amount of air left in the lungs after a normal expiration. It includes RV + ERV. It is about 2300 ml in human beings.
8. Vital Capacity (VC) - The amount of air expired maximum from both the lungs. It is IRV + TV + ERV. In human beings, it is 4600 ml.
9. Total Lung Capacity (TLC) - The total amount of air in both the lungs is called TLC. It is VC + RV. It is 5800 ml in human beings.


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