Sphygmomanometer Measures Blood Pressure

A sphygmomanometer is a commonly used medical instrument designed specifically for one primary purpose: measuring blood pressure. It is a crucial tool for monitoring cardiovascular health.

Understanding Blood Pressure Measurement

Blood pressure is the force of circulating blood on the walls of blood vessels. It's typically measured in millimeters of mercury and recorded as two numbers:

• Systolic pressure: The top number, representing the pressure in the arteries when the heart beats (contracts).
• Diastolic pressure: The bottom number, representing the pressure in the arteries when the heart rests between beats (relaxes).

The measurement is often expressed like 120/80 $mmHg$. A sphygmomanometer helps determine these values.

Analyzing the Options

Let's look at why the other options are incorrect:

• Electric current: This is measured using an ammeter, not a sphygmomanometer.
• Humidity: This refers to the amount of water vapor in the air and is measured using a hygrometer.
• Wind: The speed of wind is measured using an anemometer.
• Blood pressure: This is exactly what a sphygmomanometer is designed to measure.

Therefore, the correct function of a sphygmomanometer is to measure blood pressure.