Question

Heparin present normally in blood is formed by

• A. Granulocytes
• B. Clumped platelets
• C. Mast cell granules
• D. Monocytes

Answer 1

The correct option is C Mast cell granules

Mast cells are a type of white blood cells (WBCs) or leucocytes and contain many granules. Their granules are rich in heparin and histamine. They are formed from myeloid stem cells which are part of immune system. These cells release heparin which is an anticoagulant and prevents the clotting of blood in blood vessels by inactivating the clotting factors. Heparin is also released from basophils which are an another type of white blood cells.

So, the correct answer is 'Mast cell granules'.