Question

Mark, the pair of substances among the following which is essential for coagulation of blood.

• A. Heparin and calcium ions
• B. Calcium ions and platelet factors
• C. Oxalates adn citrates
• D. Platelet factors and heparin

Answer 1

The correct option is A Heparin and calcium ions

When the injury occurs a blood vessel starts bleeding, this bleeding is stopped by a process called as blood clotting or coagulation of blood. Blood has three main components :

1. Red blood cells
2. White blood cells
3. Platelets

Platelets disintegrate at the site of injury and release a phospholipid called platelet factor-3 ( Platelet thromboplastin ) and lipoprotein ( Thromboplastin), they both combine with calcium ions to clot the blood.

Heparin is an antiprothrombin-anticoagulant in the presence of calcium ions, it does not clot the blood.

So, the correct option is ' Calcium ions and platelet factors'.