The components of a blood component are as follows:

• Erythrocytes or RBCs red blood cells - Carry oxygen and contain pigment.

• Haemoglobin - Haemoglobin combines with its oxygen and forms Oxyhaemoglobin, which carries oxygen to the oxygen-deprived areas of the human body.

• Leukocytes or WBCs or white blood cells - Lymphocytes are usually known to synthesise antibodies which reduce or kill germs. Neutrophils act as a defence against viruses known as phagocytosis.

• Thrombocytes or platelets in the blood - help the blood to coagulate