Blood Pressure

The force which blood exerts against the internal walls of blood vessels is termed as blood pressure.

  1.  Ventricular contractions generates BP (Blood Pressure).

  2. This pressure forces the blood through the pulmonary & systematic circuits.

  3. BP is present throughout the vascular system.

  4.  The arterial BP up and down according to the phases of cardiac cycle.



1. Systolic Pressure


The ventricles contract. There walls force the blood in into the pulmonary arteries and aorta. Thus the BP in these arteries rises rapidly.

The maximum pressure gained during ventricular contractions is called systolic pressure.

Normal systolic pressure for young adults is 120 mm Hg.

2. Diastolic Pressure


When the ventricles relaxed. Thus the arterial pressure becomes low.

The lowest pressure before the next ventricular contraction called diastolic pressure.

It is normally approximate 80 mm Hg in adults.

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