Question

Which of the following are required for blood clotting?

• A. $K^{+}$, thromboplastin
• B. $C{a}^{2+}$, thromboplastin
• C. $N{a}^{+}$, $C{a}^{2+}$
• D. $K^{+}$, prothrombin

Answer 1

Answer: (B)

$C{a}^{2+}$, thromboplastin

At the site of injury, the ruptured tissue cells release thromboplastin/thrombokinase/Factor X which acts as an enzyme with $C{a}^{+}$ which converts prothrombin (inactive) into thrombin (active). Thrombin converts soluble fibrinogen into insoluble fibrin which forms a mesh-like structure to trap the blood cells forming a clot.