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# ERV $+$ RV$=$ $?$ for lungs?

Last updated date: 24th Jul 2024
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Hint: Lung volume is referred to as respiratory volume. It is the amount of gas in the lungs at any given point in the respiratory cycle. Lung capacities are calculated by adding together various lung volumes. The total lung capacity of an adult male is about $6$litres. There are four lung volumes: volume of tide, volume of reserve inspiration, volume of reservation and volume of residual reserves and four volumes of lung: Vital capacity, inspirational capacity, residual functionality and total pulmonary capacity.

The functional residual capacity (FRC), which is approximately$2,400{\text{ }}ml$, is the volume of air left in the lungs after a typical expiration $\left( {FRC{\text{ }} = {\text{ }}RV{\text{ }} + {\text{ }}ERV} \right)$. The FRC is a lung capacity that is calculated as the number of two or more volumes. It cannot even be determined directly with spirometry and must be estimated. This is due to the fact that FRC is a composite of the expiratory reserve volume (ERV) and the residual volume (RV). The residual volume is the amount of air that remains in the lungs after expelling as much air as possible. Since the residual volume is never exhaled, it cannot be measured using spirometry, and it is the air that causes the alveoli to remain open. After passive exhalation, the expiratory reserve volume (ERV) is the quantity of air that can be exhaled forcefully. As a result, the FRC can be expressed as follows: $FRC = {\text{ }}RV + ERV$
At FRC, the opposing elastic recoil forces of the lungs and chest wall are in balance, and the diaphragm or other respiratory muscles do not exert any effort. Height, gender, posture, and changes in lung enforcement all have an effect on it. The greatest influence is exerted by height.

Note:
The expiratory reserve volume (ERV), which is approximately $1,200{\text{ }}ml$, is the additional air that can be forcefully exhaled after a standard tidal volume has expired. The residual volume (RV), which is approximately $1,200{\text{ }}ml$, is the amount of air that remains in the lungs after the expiratory reserve volume has been exhaled.