A person breathing normally at rest, takes in and expels approximately half a litre of air during each respiratory cycle. This is called :
tidal volume
vital capacity
inspiratory reserve volume
expiratory reserve volume
A.
tidal volume
Tidal volume is the amount of air inspired or expired in a single breath by a person at rest. It is about 500 ml for an average adult human male.
Vital capacity is the greatest volume of air that can be expelled from the lungs after taking the deepest possible breath.
Inspiratory reserve volume (IRV) is the additional air that can be forcibly inhaled after the inspiration of a normal tidal volume.
Expiratory reserve volume or ERV is the additional amount of air that can be expired from the lungs by determined effort after normal exiration.
