Represents the volume of gas inhaled or exhaled during a single respiratory cycle. (average is 500mL)
Dead air space
This accounts for 150 mL. It is either anatomic or physiologic. Anatomic includes dead air in the airway passages (trachea, bronchi) that are incapable of gas exchange. Physiologic is alveoli that have potential but can't do to disease or obstruction (COPD, atelectasis).
Alveolar air volume
Is the amount of air that does not reach the alveoli for gas exchange. It is the difference between tidal volume and dead-space volume
amount of air moved in and out of the respiratory tract per minute. Tidal volume x ventilatory rate = Minute volume
Functional reserve capacity
the volume of air remaining in the lungs at the end of a normal expiration.
after a maximal forced exhalation, this is the amount of air remaining in the lungs and airway passages not expelled
Inspiratory reserve volume
amount of gas that can be forcefully inspired in addtion to a normal breath's tidal volume
Expiratory reserve volume
amount of gas that can be forcefully expired at the end of a normal expiration