<P> Blood pressure ( BP ) is the pressure of circulating blood on the walls of blood vessels . When used without further specification , `` blood pressure '' usually refers to the pressure in large arteries of the systemic circulation . Blood pressure is usually expressed in terms of the systolic pressure ( maximum during one heart beat ) over diastolic pressure ( minimum in between two heart beats ) and is measured in millimeters of mercury ( mmHg ) , above the surrounding atmospheric pressure ( considered to be zero for convenience ) . </P>
<P> Blood pressure ( BP ) is the pressure of circulating blood on the walls of blood vessels . When used without further specification , `` blood pressure '' usually refers to the pressure in large arteries of the systemic circulation . Blood pressure is usually expressed in terms of the systolic pressure ( maximum during one heart beat ) over diastolic pressure ( minimum in between two heart beats ) and is measured in millimeters of mercury ( mmHg ) , above the surrounding atmospheric pressure ( considered to be zero for convenience ) . </P>
what is systolic blood pressure a measure of
what is systolic blood pressure a measure of
systolic pressure ( maximum during one heart beat )
systolic pressure ( maximum during one heart beat )