What term is used for the pressure in the artery of human body during relaxation?
Diastolic pressure
The question asks for the term used for the pressure inside an artery while the heart is relaxing.
The heart works in a repeating cycle of contraction (systole) and relaxation (diastole), and blood pressure is written as two numbers reflecting these two phases.
When the heart muscle relaxes and its chambers refill with blood, the pressure in the arteries falls to its lowest value; this minimum arterial pressure during relaxation is called diastolic pressure and is the lower number in a reading such as 120/80 mmHg.
By contrast, systolic pressure is the higher value recorded when the heart contracts and forces blood out into the arteries, so it is the pressure during contraction, not relaxation.
Venous pressure refers to the much lower pressure in the veins that carry blood back to the heart, and capillary pressure refers to pressure in the tiny capillaries where exchange occurs - neither describes arterial pressure during relaxation.
Hence, the correct answer is Diastolic pressure.
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