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In a study that seeks to evaluate the effect caffeine has on narcoleptics,40 narcoleptic patients are randomly selected to participate.Fifteen of the patients are given high doses of caffeine,15 are given moderate doses,and 10 are given low doses over a period of 30 days.The total amount of time they slept over the 30 days was recorded.This is BEST described as a(n) _____ study.
Total Lung Capacity (TLC)
The maximum amount of air the lungs can contain, typically measured after a maximal inhalation effort.
Spirometer
An instrument used to measure the volume of air inhaled and exhaled by the lungs, assessing pulmonary function.
Functional Residual Capacity (FRC)
The amount of air left in the lungs following a standard breath out.
Residual Volume (RV)
The volume of air remaining in the lungs after a maximal exhalation, important for keeping the lungs inflated.
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