What is the Vital Capacity if the Functional Residual Capacity is 2300 mL, Residual Volume is 1200 mL, and Inspiratory Capacity is 3500 mL?
Vital capacity can be calculated by adding the Inspiratory Capacity and Expiratory Reserve Volume.
Calculation of Vital Capacity
Vital Capacity (VC) is the total amount of air that can be exhaled after a deep inhalation. It is a crucial measure of lung function as it indicates the maximum amount of air that can be moved in and out of the lungs. To calculate the Vital Capacity in this scenario, we need to consider the given values of Functional Residual Capacity (2300 mL), Residual Volume (1200 mL), and Inspiratory Capacity (3500 mL).
Inspiratory Capacity: This is the maximum volume of air that can be inhaled after a normal exhalation. In this case, it is given as 3500 mL.
Expiratory Reserve Volume (ERV): ERV is the additional volume of air that can be exhaled after a normal exhalation. It is calculated as Functional Residual Capacity - Residual Volume. Therefore, ERV is (2300 mL - 1200 mL) = 1100 mL.
Now, to find the Vital Capacity:
Vital Capacity = Inspiratory Capacity + ERV
Vital Capacity = 3500 mL + 1100 mL
Vital Capacity = 4600 mL
Therefore, the Vital Capacity in this scenario is 4600 mL (Option 3).
Understanding the respiratory capacities and volumes is essential for evaluating lung function and diagnosing respiratory issues. The Vital Capacity measurement is particularly important in assessing the overall health of an individual's respiratory system. By determining the maximum amount of air that can be exhaled, healthcare professionals can identify potential breathing problems and tailor treatment plans accordingly.
For further information on Respiratory volumes and capacities, you can explore additional resources and educational materials to deepen your understanding of pulmonary function tests and respiratory physiology.