Final answer:
Lung volumes are measured in terms of volumes and capacities. Lung size is determined by genetics, sex, and height. The average lung can hold almost six liters of air.
Step-by-step explanation:
Human lung size is determined by genetics, sex, and height. At maximal capacity, an average lung can hold almost six liters of air, but lungs do not usually operate at maximal capacity. Air in the lungs is measured in terms of lung volumes and lung capacities. Volume measures the amount of air for one function (such as inhalation or exhalation). Capacity is any two or more volumes (for example, how much can be inhaled from the end of a maximal exhalation).