Which vital sign is measured using a sphygmomanometer?

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A sphygmomanometer is a medical instrument specifically designed to measure blood pressure, which is the force exerted by circulating blood on the walls of blood vessels. This measurement is crucial for assessing a person's cardiovascular health. Blood pressure is expressed in two numbers: systolic pressure, which occurs when the heart beats, and diastolic pressure, which occurs when the heart is at rest between beats.

Other vital signs, such as body temperature, heart rate, and respiration rate, require different equipment and methods for measurement. For instance, body temperature is usually taken with a thermometer, heart rate is measured by feeling the pulse or using a heart rate monitor, and respiration rate is assessed by counting the number of breaths taken in a minute. Each of these signs provides important information about a person's health but involves separate techniques and instruments outside the use of a sphygmomanometer.