Lung capacities pdf

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Abstract. Background: Vital Capacity (VC) is defined as a change in volume of lung after maximal inspiration followed by maximal expiration is called Vital Capacity of lungs. It is the sum of Lung Volumes and Capacities Measurement of lung volumes provides a tool for understanding normal function of the lungs as well as disease states. The breathing cycle is initiated by expansion of the chest. Contraction of the diaphragm causes it to flatten downward. If chest muscles are used, the ribs expand outward. Total lung capacity (TLCTotal lung capacity (TLC ( ( It the volume of air contained in the lung atIt the volume of air contained in the lung at the end of maximal inspirationthe end of maximal inspiration.. TLC = IRV + TV + ERV + RVTLC = IRV + TV + ERV + RV ==30003000++500500++11001100++12001200==58005800 mlml.. 17. From a physiological standpoint, the lung volumes are either dynamic or static. Both subclasses are measured at different degrees of inspiration or expiration; however, dynamic lung volumes are characteristically dependent on the rate of air flow. The static lung volumes/capacities are further subdivided into four standard volumes (tidal, inspiratory reserve, expiratory reserve, and residual the lung during a maximal forced inspiration effort that begins at the end of a normal tidal expiration (VT+IRV=3L). Vital Capacity (VC): The volume of air that is expelled from the lung during a maximal forced expiration effort starting after a maximal forced inspiration (4.5L). Total Lung Capacity (TLC): The volume of air that is inhaled into Static lung volumes are commonly described as either volumes, which are not subdivided, or capacities, which consist of at least two lung volumes. Capacities include total lung capacity (TLC), functional residual capacity (FRC), vital capacity (VC), and inspiratory capacity (IC). Volumes include residual volume (RV), expiratory reserve Lung Capacities a lung capacity includes ≥ 2 lung volumes Inspiratory Capacity (IC) TV + IRV IC ~ 3,500 mL Functional Residual Capacity (FRC) ERV + RV volume of gas that remains in lungs following normal TV expiration equilibrium volume of lungs FRC ~ 2,400 mL Vital Capacity (VC) IC + ERV = TV + IRV + ERV There are variations in vital capacity of individuals in relation to their heights, within the same ethnic and age groups. BACKGROUND Vital Capacity (VC) is defined as a change in volume of lung after maximal inspiration followed by maximal expiration is called Vital Capacity of lungs. It is the sum of tidal volume, inspiratory reserve volume .and expiratory reserve volume. Vital capacity of The average volume is 500 ml per breath and it is sometimes called a resting breath. Each breath is divided into two separate volumes: A. Alveolar volume The volume of air that actually makes it into the alveoli. For a resting breath this is about 350 ml. Remember this is simply an additional 350 ml to what is already in the alveoli and this This volume supplies enough oxygen for your cells. •€The average volume is about 500 ml for adult men and women. 2) Vital capacity is the amount of air that can be forced out of your lungs when you take a very deep breath. •€The average adult volume is between 3 and 5 Liters (or 3,000ml-5,000ml). Questions: (1 point each). a. Inspired and