Final answer:
To record a flow-volume loop with a volume displacement spirometer, a bellows-type spirometer is required. It measures the changes in volume caused by airflow into and out of the lungs, making it suitable for such recordings.
Step-by-step explanation:
The device required to record a flow-volume loop with a volume displacement spirometer is a bellows-type spirometer. A bellows-type spirometer works by detecting volume changes due to airflow in and out of the lungs, which makes it suitable for creating flow-volume loops. Options such as a pneumotachometer or a turbine flowmeter are used in other types of spirometric devices that measure the rate of airflow rather than volume displacement directly. However, for a flow-volume loop, which is a graphical representation of the rate of airflow on the y-axis versus the total volume of air exhaled on the x-axis, the bellows-type spirometer is the correct answer.
The flow-volume loop is important in respiratory medicine as it is used to diagnose and differentiate between obstructive and restrictive lung diseases. By assessing how quickly and how much air a person can exhale, medical professionals can gain insight into the lung function and health of the patient.