Final answer:
The incorrect statement about platelets is that their lifespan is 30 to 60 days when, in fact, platelets only have a lifespan of about 10 days before being removed by the liver and spleen.
Step-by-step explanation:
The statement about platelets that is incorrect is: 3) The life span of platelets is 30 to 60 days. Platelets, also known as thrombocytes, are essential for the clotting process and are indeed fragments of a larger cell called a megakaryocyte. They play a critical role in preventing blood loss by forming clots at the site of a wound. The formation of platelets is regulated by the hormone thrombopoietin, and platelets contain substances like serotonin, ADP, calcium, and PDGF which are crucial for the clotting mechanism. However, the actual lifespan of platelets is only about 10 days before they are removed by the liver and spleen, a much shorter period than the 30 to 60 days stated in the incorrect statement.