Question

Blood platelets are found only in the blood of:

• A. birds
• B. reptiles
• C. mammals
• D. amphibians

Answer 1

Answer: (C)

mammals

Answer 2

Platelets are irregularly shaped membrane bound cell fragments. These are found only in the blood of mammals they usually lack nuclei and are formed from special bone marrow. They are responsible for blood clotting there are about $250,000$ platelets per $m{{m}^{3}}$ of blood. They survive $5$ to $9$ days before being destroyed by the spleen and liver.