Question

Prothrombin, which helps in clotting of blood, is released by

• A. Monocytes
• B. Erythrocytes
• C. Lymphocytes
• D. Blood platelets

Answer 1

The correct option is D Blood platelets

Prothrombin is an important plasma protein which is essential for clotting of blood. It is converted into thrombin at the presence of thromboplastin which is realesed by blood platelates at the site of injury. The thrombin then converts the protein fibrinogen into insoluble fibrin, which further prevents blood loss by blood arresting, plugging holes in small blood vessels and by blood clotting.

So, the answer is D