Blood platelets are small cells about 1/3rd the size of a red blood cell. They are spherical or oval non-nucleated discs, numbering about 2, 50,000 per cubic millimeter. They are produced in the bone marrow and after a few days of life, they die in the spleen.
1. Initiates blood clotting:
It helps in clotting by producing the enzyme thombokinase.
2. Repairs capillary endothelium:
It sticks together to any damaged place in a blood vessel.
3. Body defense:
Thrombocytes also play some part in the mechanism of defense against infection.