Which of the following parts of a sphygmomanometer is used to read the systolic and diastolic values of a patient's blood pressure?

The cuff is used to create pressure around the arm to restrict blood flow, allowing for the measurement of blood pressure. However, it does not display the readings itself; it merely serves as a means to facilitate the measurement process.

The diaphragm is part of the sphygmomanometer that detects the vibrations of blood flow and contributes to the measurement process. While it plays a crucial role in sensing the pressure changes, it does not provide the actual readout of blood pressure values.

The inflation bulb is utilized to manually inflate the cuff and create the necessary pressure to occlude blood flow temporarily. It is essential for the measurement process but does not display the blood pressure readings.

The pressure control valve regulates the release of air from the cuff, allowing for gradual deflation during measurement. Like the inflation bulb, it is pivotal for the operation of the sphygmomanometer but does not provide the blood pressure values itself.