The pressure exerted by the blood as it flows through the blood vessels is called blood pressure. A sphygmomanometer is a device for measuring blood pressure. It is of two types.
1. Hypertension: Systolic pressure is the maximum pressure exerted by the flowing blood on the walls of the arteries when the ventricles of the heart are contracted. It is equal to 120 mm Hg pressure.
2. Hypotension: Diastolic pressure is the pressure exerted by the flowing blood on the walls of the arteries when the ventricles of the heart are dilated. It is equal to 80 mm Hg pressure.
