![]() Residual Volume (RV): The residual volume is the volume of air left in the lungs at the end of maximal expiration Volume which we can tap into when our tidal volume increases with exercise or activity. ![]() Inspiratory Capacity (IC): Sum of the tidal volume plus the inspiratoryĮxpiratory Reserve Volume (ERV): This is the difference between the volume of air left in the lung at the conclusion of normal expiration versus at the conclusion of maximal expiration. This means that we have a reserve volume that we can tap into as tidal volume increases with exercise or Inspiratory Reserve Volume (IRV): Total lung capacity minus the volume of air in the lung at the end of a normal inspiration. Tidal volume increases with exercise or activity. Tidal Volume (V T): This is the volume of air taken into the lungs when you inhale. Table 1 - Respiratory Volumes and Capacities (approximates which will vary ![]() Machines and quickly figure out how to use them! A modern spirometer looks a lot like a little adding machine with a mouthpiece, air tube and a small printout or a cable that feeds data into a computer! There are many brands available,Įach is a little different! One model is displayed below. The bell housing with the paper recording revolved electrically or was driven by a windup mechanism. Working on the assumption that loss of volume of air in the bell housingĬorrelated directly with the volume of CO 2 exhaled and absorbed. A CO 2Ībsorber could be placed in the bell housing and used in experiments to determine O 2 consumption, ![]() Pulleys attach the canister bell to a pen which records volumes on paper on the outside of the canister. The volumes and capacities listed here are normally determined using a spirometer! A traditional "bell spirometer" is a canister of water with an inverted canister bell over it with air space inside the invertedĬanister bell. ![]()
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