Blood contained in blood vessels is a connective tissue in form of a red viscous fluid. On an average, a healthy man has about 5 litres of blood in his body, while a women has about 500 ml less than a man. Total volume of blood is said to be around 60-80ml per kg of body weight.
Constituents of Blood :
There are two main constituents of blood : solid or cellular part called blood cells (35 %) and the fluid called as plasma (65 per cent).
The blood cell are further divided in two parts.
1) Red Blood Corpuscles (RBC) : These are disc-shaped cells without nucleus and contains pigment called Haemoglobin which gives the red color of the blood. Haemoglobin is a iron containing pigment . RBC are produced in the spleen and the bone marrow. Haemoglobin picks up oxygen in the lungs by forming a chemical compound.
2) White Blood Corpuscles (WBC) : These are round semi-transparent cells containing a nucleus and are little larger in size than RBC. The WBC are the soldiers of the body’s defence systemand their main function is to combat infection
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