The spirometer measures the total amount of air that the lungs can hold,or:

Question

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The spirometer is used to measure the forced vital capacity, which is the total amount of air that the lungs can hold after a deep breath in, followed by a forceful exhale. Forced expiratory volume (A) refers to the amount of air that can be forcefully exhaled in one second, and is also measured using a spirometer, but it is not the same as total lung capacity. Exercise tolerance (C) is a measure of how much physical activity a person can tolerate before experiencing fatigue or other symptoms, and is not directly related to lung capacity. Total aeration volume (D) is not a commonly used term in respiratory physiology and is not a relevant option.

The Spirometer Measures the Total Amount of Air That the Lungs