What are diastole and systole in blood pressure?
Last reviewed Tue 10 April 2018
By Joana Cavaco Silva
Reviewed by Suzanne Falck, MD, FACP
The terms diastole and systole refer to when the heart muscles relax and contract. The balance between diastole and systole determines a person's blood pressure.
The heart is a pump that supplies all tissues and organs of the body with oxygen-rich blood. The heartbeat is caused by the heart muscles relaxing and contracting.
During this cycle, the period of relaxation is called diastole and the period of contraction is called systole.
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