Question

Consider the following. Assertion (A): In blood banks, clotting of blood is prevented by adding citrates or oxalates of sodium. Reason (R): Citrates or oxalates bind to Ca$^{2+}$ ions and prevent the activation of prothrombin.

• A. Both (A) and (R) are correct, (R) is the correct explanation of (A)
• B. Both (A) and (R) are correct, (R) is not the correct explanation of (A)
• C. (A) is correct, but (R) is not correct
• D. (A) is not correct, but (R) is correct

Hint:

Blood clotting requires calcium ions. \[ \boxed{ \text{Prothrombin} \xrightarrow[\text{Ca}^{2+}]{} \text{Thrombin} } \] Sodium citrate and sodium oxalate prevent clotting by chelating Ca$^{2+}$ ions.

Answer 1

The Correct Option is A