Which of the following statements about platelets is INCORRECT?
- Platelets are essential for clotting process.
- Platelets are fragments of a larger cell called megakaryocyte.
- The life span of platelets is 30 to 60 days.
- The formation of platelets is regulated by the hormone thrombopoietin.
- Platelets contain serotonin, ADP, calcium and PDGF.
Answer: The life span of platelets is 30 to 60 days.