Answer:
The blood pressure is the measure of the strength by which the blood pushes against the side of the blood vessels when it circulates inside the body.
Explanation:
When heart beats, the heart pumps the blood around the body to supply energy/oxygen to the various parts of the body where it is needed.
As the blood circulates, it pushes against sides of blood vessels. The strength of pushing of the blood is measured by blood pressure. Most of the pressure is due to the work done by the heart in pushing the blood.
It is measure by using sphygmomanometer. Two numbers are used to measure the blood pressure.
Systolic blood pressure is the first digit used for measuring blood pressure and it measures pressure in blood vessels when heart beats.
Disystolic blood pressure is the second digit used for measuring blood pressure and it measures the pressure of blood in the vessels when heart is resting between beats.
