Final answer:
C) forced expiratory volume in 1 second. The measurement used in the evaluation of asthma is the forced expiratory volume in 1 second (FEV1) in relation to the total forced vital capacity (FVC). The ratio of FEV1 to FVC is used to diagnose lung diseases like asthma. In asthma, there is resistance in the lung, making it hard for the patient to exhale air, resulting in a low FEV1/FVC ratio.
Step-by-step explanation:
The measurement used in the evaluation of asthma is the forced expiratory volume in 1 second (FEV1) in relation to the total forced vital capacity (FVC).
FEV1 measures how much air can be forcibly exhaled in one second after taking a deep breath, while FVC measures the total amount of air that can be forcibly exhaled. The ratio of FEV1 to FVC, known as the FEV1/FVC ratio, is used to diagnose lung diseases like asthma.
In asthma, there is resistance in the lung, making it hard for the patient to exhale air, resulting in a low FEV1/FVC ratio. Breathing becomes difficult and complications arise. Spirometry, a technique used to measure lung volumes, is commonly used to evaluate asthma.