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

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