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oxygen and forms oxyhaemoglobin which is mainly responsible for

transportation of oxygen in the body. Haemoglobin also transports some
amount of carbon dioxide.

If there is a deficiency of haemoglobin in the blood of a person, it
becomes difficult to provide oxygen efficiently to all the cells of his body.

It is the presence of haemoglobin which makes the blood appear red.

 White Blood Cells or White Blood Corpuscles (WBC): These are present
in various shapes. WBCs show amoeboid or amoeba-like movement that helps

them to reach the site of infection. WBCs engulf foreign particles and harmful
microbes. Thus, WBCs help in fighting the diseases. WBCs make up the

immune system of the body.

 Platelets: Platelets are the smallest blood cells, responsible for clotting or
coagulation of blood. In case of an injury, the blood clots after some time. This

prevents excess loss of blood. Clotting of blood is a defence mechanism in the

body.