![]() ![]() The value varies according to age and body size. The vital capacity (VC), about 4,800 mL, is the total amount of air that can be expired after fully inhaling (VC = TV + IRV + ERV = approximately 80 percent TLC).The total lung capacity (TLC), about 6,000 mL, is the maximum amount of air that can fill the lungs (TLC = TV + IRV + ERV + RV).Summing specific lung volumes produces the following lung capacities: Residual volume (RV), about 1,200 mL, is the volume of air still remaining in the lungs after the expiratory reserve volume is exhaled.The expiratory reserve volume (ERV), about 1,200 mL, is the additional air that can be forcibly exhaled after the expiration of a normal tidal volume. ![]() The inspiratory reserve volume (IRV), about 3,100 mL, is the additional air that can be forcibly inhaled after the inspiration of a normal tidal volume.The tidal volume (TV), about 500 mL, is the amount of air inspired during normal, relaxed breathing.The following terms describe the various lung (respiratory) volumes: Quiz: Regulation of Urine Concentration.Quiz: Structure of the Digestive Tract Wall.Quiz: Function of the Respiratory System.Quiz: Structure of the Respiratory System.Quiz: Supplements to the Immune Response.Quiz: Humoral and Cell-Mediated Immune Responses.Humoral and Cell-Mediated Immune Responses.Quiz: Specific Defense (The Immune System).The Immune System and Other Body Defenses.Quiz: Functions of the Cardiovascular System.Quiz: The Hypothalamus and Pituitary Glands.Quiz: The Ventricles and Cerebrospinal Fluid.Quiz: Muscle Size and Arrangement of Muscle Fascicles.Muscle Size and Arrangement of Muscle Fascicles.Quiz: Structure of Cardiac and Smooth Muscle.Quiz: Connective Tissue Associated with Muscle Tissue.Connective Tissue Associated with Muscle Tissue.Quiz: Chemical Reactions in Metabolic Processes.Chemical Reactions in Metabolic Processes.Quiz: Atoms, Molecules, Ions, and Bonds.On average, under non-exertion conditions, the human respiratory rate is 12–15 breaths/minute. The number of breaths per minute is the respiratory rate. \): A tissue layer called pleura surrounds the lung and interior of the thoracic cavity. ![]()
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