Question

Which of the following are required for blood clotting?

• A. K${}^{+}$, thromboplastin
• B. Ca${}^{+}$${}^{+}$, thromboplastin
• C. Na${}^{+}$, Ca${}^{+}$${}^{+}$
• D. K${}^{+}$, prothrombin

Answer 1

The correct option is B Ca${}^{+}$${}^{+}$, thromboplastin

When there is an injury and blood is shed, the platelets disintegrate and liberate thromboplastin or factor III. Certain amount of thromboplastin is also derived from the damaged tissues of the injured locality.
Thromboplastin converts prothrombin into thrombin with the help of calcium ions and thrombin interacts with fibrinogen forming fibrin. This is clot.
Calcium is the Factor IV and it acts as a co-factor in the coagulation process.
Thus, the correct answer is option (B).