Total lung capacity (TLC): Volume of air in the lungs after maximal inspirationįorced expiratory volume (FEV1): Volume that can be expired in 1 second of maximum forced expirationĬopyright © 2023, StatPearls Publishing LLC. Vital capacity (VC): Maximum volume able to be expired after maximal inspiration Inspiratory capacity (IC): Volume that can be breathed after normal exhalationįunctional residual capacity (FRC): Volume remaining in the lungs after normal expiration Residual volume (RV): Volume remaining in lung after maximal expiration (cannot be measured by spirometry) Tidal volume (TV): Volume inspired and expired with each breathĮxpiratory reserve volume (ERV): Volume that can be expired after a normal breath Inspiratory reserve volume (IRV): Volume that can be breathed after a normal inspiration The significant lung volumes/capacities and their definitions are listed below: The external intercostals are inspiratory muscles used primarily during exercise and respiratory distress. dynamic lung capacities Static lung volumes There are five: a. The diaphragm is the primary respiratory muscle and receives innervation by the nerve roots of C3, C4, and C5 via the phrenic nerve. bunty Terms in this set (29) Lung capacities and volumes These can be divided into two groups: i. The alveoli are the primary location for gas exchange. The lungs further divide into individual lobes, which ultimately subdivide into over 300 million alveoli. The respiratory system is composed primarily of the nose, oropharynx, larynx, trachea, bronchi, bronchioles and lungs. Oxygen gets transported through the alveoli into the capillary network, where it can enter the arterial system, ultimately to perfuse tissue. The average total lung capacity of an adult human male is about 6 litres of air. Lung capacities are derived from a summation of different lung volumes. It refers to the volume of gas in the lungs at a given time during the respiratory cycle. The lungs are the foundational organs of the respiratory system, whose most basic function is to facilitate gas exchange from the environment into the bloodstream. Lung volumes are also known as respiratory volumes.
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