Question
Biology Question on body fluids and circulation
When body tissues are injured resulting in the loss of blood, the process of blood clotting begins and the blood platelets release
A
Thromboplastin
B
Fibrinogen
C
Thrombin
D
Prothrombin
Answer
Thromboplastin
Explanation
Solution
During an injury, the blood platelets release thromboplastin which converts plasma protein prothrombin into thrombin in the presence of calcium ions. Thrombin then converts soluble plasma protein fibrinogen into fibrin which forms a meshwork by trapping red blood cells, thus forming a clot.