Question

Life span of platelet is

• A. 8 - 9 days
• B. 9 - 12 days
• C. 20 - 30 days
• D. 90 days

Answer 1

The correct option is A 8 - 9 days

Life span of platelets is 8 - 9 days. Platelets, also called thrombocytes, are blood cells, whose function is to stop bleeding. Platelets have no nucleus: they are fragments of cytoplasm, which are derived from the megakaryocytes of the bone marrow, and then enter the circulation. These unactivated platelets are biconvex discoid structures. Life span of individual platelets is controlled by the internal apoptotic regulating pathway. Old platelets are destroyed by phagocytosis in the spleen and liver.