What is the name of the instrument used to indirectly determine arterial blood pressure?

The instrument used to indirectly determine arterial blood pressure is known as a sphygmomanometer. This device measures blood pressure by occluding the blood flow in the arteries and then gradually releasing the pressure, allowing the healthcare provider to listen for specific sounds (Korotkoff sounds) through a stethoscope. The readings obtained from the sphygmomanometer reflect the systolic and diastolic pressures in the arteries, which are crucial for assessing cardiovascular health.

In this context, the other options are related to different medical functions. A tensiometer is primarily used in agriculture to measure soil moisture tension rather than blood pressure. Meanwhile, a stethoscope is a tool for listening to internal sounds of a body, such as heartbeats and lung sounds, but it does not measure blood pressure directly by itself. Lastly, a hemometer is used for measuring hemoglobin levels in blood, which is unrelated to blood pressure measurement. Thus, the sphygmomanometer is specifically designed for blood pressure assessment, making it the correct choice.