Blood pressure

Blood pressure is the force or pressure that the blood on the walls of blood vessels.

Systematic arterial blood pressure maintain the essential flow of blood into and out of the organ of the body keeping blood pressure within normal limit is very important damage blood vessels, causing bleeding from sides of blood vessels rupture. Blood flow through tissue beds

may be inadequate . If blood pressure is too low. this is particularly dangerous for essential organs such as heart,brain or kidney.

Blood pressure Falls at rest and during sleep It increases with age and it usually higher in women than in men.
1. Nervous System(Human)

2.heart rate

3.blood 
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Blood

The blood is transport substances around the body through a large network of blood vessels.In adults body contains five-six litres of blood. It consist of two parts a fluid called plasma, and blood cells suspended in the plasma.

plasma .This is ninety% water with a wide range of substance dissolved or suspended in it there includes :

1) nutrients absorbed from the alimentary canal

2) oxygen absorbed from the lungs.

blood cells .there are three distinct groups, classified according to their functions

red blood cell transport oxygen to a lesser extent, carbon dioxide between the lungs and all body cells.

white blood cells are mainly concentrated with the protection of body against interfacing and foreign substances there are several type of leukocytes, which carry out their protective function in the different ways . this cells are larger and less numerous than erythrocytes.

1.Blood pressure(click here)

2 . Nervous System(Human)

3.heart rate

(click this word for more information)