What is meant by diastolic blood pressure?

Diastolic pressure: The diastolic blood pressure represents the lowest blood pressure that the vessels are subjected to during the circulation of the blood by the pumping action of the heart , and this occurs just before each heartbeat. The systolic blood pressure is the highest pressure in the blood vessels and this occurs immediately after each heart beat.

Blood vessels: It is the second or lower reading of a BP reading. For instance: 120/70 - 70 is the diastolic bp. It reflects the elasticity of the smaller vessels in the arterial tree. It requires a competent aortic valve also. It carries equal weight with the upper number (systolic) when diagnosing high blood pressure. 85 is the top end of normal. With a few exceptions, lower is generally better.