Ace the CBET Challenge 2025 – Master Biomedical Equipment with Style!

A spirometer is an instrument designed specifically to measure various aspects of lung function, primarily focusing on the volume of air inhaled and exhaled during breathing. Tidal volume refers to the amount of air that is taken in or expelled during a normal breath, making it a fundamental measure of respiratory health. This measurement is crucial for assessing conditions such as asthma, chronic obstructive pulmonary disease (COPD), or any other lung function abnormalities.

The other options, while related to respiratory or cardiovascular functions, do not pertain directly to what a spirometer measures. Systolic pressure is a cardiovascular metric indicating the pressure in the arteries during heartbeats. Inspiratory pressure, while related to breathing effort, is typically measured using different devices. Residual air capacity refers to the amount of air remaining in the lungs after a full exhalation, which is not directly measured by a standard spirometer but may require additional testing methods. Thus, the primary and correct function of a spirometer is to measure tidal volume, making it an essential tool in respiratory therapy and diagnostics.