<prompt> Life span of platelets is:120 days10 days30 days60 days  <response>: Platelets are small, granulated bodies that aggregate at sites of vascular injury. They lack nuclei and are 24 μm in diameter. There are about 300,000μL of circulating blood, and they normally have a half-life of about 4 days. The megakaryocytes, giant cells in the bone marrow, form platelets by pinching off bits of cytoplasm and extruding them into the circulation.Life span of platelets is around 8-10 days.Reference: Ganongs Review of Medical Physiology T W E N T Y - F I F T H E D I T I O N page no 555 