The volume in the lung can be divided into four units: tidal volume, expiratory reserve volume, inspiratory reserve volume, and residual volume. How much air can be forced out of the lungs over a specific time period, usually one second Total volume of air in the lungs after a maximal inspiration Volume of air remaining after a normal exhalation Volume of air that can be inhaled in addition to a normal exhalation Maximum amount of air that can be moved in or out of the lungs in a single respiratory cycle Lung Volumes and Capacities (Avg Adult Male) Volume/CapacityĪmount of air inhaled during a normal breathĪmount of air that can be exhaled after a normal exhalationĪmount of air that can be further inhaled after a normal inhalationĪir left in the lungs after a forced exhalation Inspiratory capacity is the amount of air taken in during a deep breath, and residual volume is the amount of air left in the lungs after forceful respiration. Tidal volume is the volume of air inhaled in a single, normal breath. The total lung capacity of the adult male is six liters. Human lung volumes and capacities are shown. Capacity is any two or more volumes (for example, how much can be inhaled from the end of a maximal exhalation). Volume measures the amount of air for one function (such as inhalation or exhalation). Air in the lungs is measured in terms of lung volumes and lung capacities ( Figure 20.12 and Table 20.1). At maximal capacity, an average lung can hold almost six liters of air, but lungs do not usually operate at maximal capacity. Human lung size is determined by genetics, gender, and height. In this case, it is not because they run fast but because they have a large body and must be able to take up oxygen in accordance with their body size. Elephants also have a high lung capacity. Cheetahs have evolved a much higher lung capacity than humans it helps provide oxygen to all the muscles in the body and allows them to run very fast. Different animals have different lung capacities based on their activities.
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