What is Blood Pressure – Definition, Systolic & Diastolic Blood Pressure

Presentation Notes on Blood Pressure, Classifications & Types of Blood Pressure for Medical Biology students, Kids & dummies in word / .ppt /. Pdf Format


The main function of the circulatory system is to cater the various needs of tissues. The blood which is being continuously pumped by heart reaches various tissues of the body. A pressure gradient is maintained across various parts of the circulatory system which defines the amount and speed of blood flow to particular region. This phenomenon is understood by understanding the Blood Pressure. The Blood pressure or BP is vital for the perfusion of various important organs like brain, filtration of blood in kidneys etc.

Blood pressure is defined as the force exerted by the blood on unit area of vessel wall.

Usually the term bloodpressure is used to denote the arterial blood pressure unless specified. Blood pressure is defined in two types

1. Total Bloodpressure: It is the total pressure exerted by the blood at any given instance.

2. Lateral Bloodpressure: It is the pressure exerted by the blood on the vessel wall in an unit area.

Generally the term Blood pressure (B.P) denotes lateral bloodpressure in systemic arteries. Some other terms are also used for BP in other vessels like

Venous Pressure: Blood from all over the body is collected in right aorta. The pressure in the right aorta is hence called venous pressure or much correctly central venous pressure.

Peripheral Venous Pressure: Peripheral venous pressure correlates with central venous pressure of human being in recumbent position

Capillary Pressure: It is defined as the pressure in the capillaries which tends to force the fluid outward through the capillary membrane.

Systolic Bloodpressure (SBP): It is the highest BP recorded during a cardiac cycle.

Diastolic Bloodpressure (DBP): It is the lowest BP recorded during a cardiac cycle.

Pulse Pressure: It is the difference between Systolic and diastolic blood pressure.

Mean Pressure: Arithmetic mean of systolic and diastolic blood pressure. Approximately it is the sum of the diastolic pressure and 1/3rd of pulse pressure.

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