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RESIDUAL VOLUME
Residual volume is the amount of air that remains in a person's lungs after fully exhaling. Doctors use tests to measure a person's residual air volume to help check how well the lungs are functioning. It is normal to have some air remain after exhaling to keep the lungs from collapsing.
TIDAL VOLUME
Tidal volume (symbol VT or TV) is the lung volume representing the normal volume of air displaced between normal inhalation and exhalation when extra effort is not applied. In a healthy, young human adult, tidal volume is approximately 500 ml per inspiration or 7 ml/kg of body mass.
INCIPIRATORY RESERVE VOLUME
Medical Definition of inspiratory reserve volume
the maximal amount of additional air that can be drawn into the lungs by determined effort after normal inspiration — compare expiratory reserve volume.
FUNCTIONAL RESIDUAL CAPACITY
Functional residual capacity (FRC), is the volume remaining in the lungs after a normal, passive exhalation. In a normal individual, this is about 3L. The FRC also represents the point of the breathing cycle where the lung tissue elastic recoil and chest wall outward expansion are balanced and equal.
TOTAL LUNG CAPACITY
Lung volumes and lung capacities refer to the volume of air in the lungs at different phases of the respiratory cycle. The average total lung capacity of an adult human male is about 6 litres of air.
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