There are no hard and fast figures which represent a normal blood pressure. And very often doctors and other experts cannot even decide between them what an ideal blood pressure range is for an adult.
However it is usually agreed that somewhere between 110/70 and 125/80 is considered to be an average blood pressure for a grown person, though someone with naturally low blood pressure may be closer to a range of 100/60
A blood pressure of 140/90 is considered to be high, though as a person gets older, this falls into the more normal range for people.
Blood doesnt circulate in an even stream around the body, but travels in a constant series of spurts. Therefore the pressure peaks in the blood vessels just after a heart beat and then ebbs until the next one. This is a continuous process.
The two blood pressure figures represent the pressures when the forces are at their peak and at their lowest ebb. The stronger the arteries are, the more they resist the force of the blood and the lower the blood pressure.
As a person gets older, and the elasticity of their arteries weakens, the figures tend to rise. However the lower figure should still be...