Meaning of Respiratory Volume and Capacities
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12 Terms
What is tidal volume (TV)?
Air entering lungs during quiet breathing
What is inspiratory reserve volume (IRV)?
Extra air inhaled beyond tidal inspiration
What is expiratory reserve volume (ERV)?
Extra air exhaled beyond tidal expiration
What is residual volume (RV)?
Air remaining in lungs after maximum exhalation
Why is residual volume important?
Prevents alveolar collapse.
What is total lung capacity (TLC)?
Sum of all lung volumes.
What is vital capacity (VC)?
TV + IRV + ERV.
What is inspiratory capacity (IC)?
TV + IRV
What is functional residual capacity (FRC)?
ERV + RV
What is anatomical dead space?
Air in airways that does not reach alveoli
What is alveolar dead space?
Air in nonfunctional alveoli.
What is total dead space?
Anatomical + alveolar dead space
