Question

The blood does not clot inside the body because of

• A. Oxygenation of blood
• B. Movement of blood
• C. Absence of active clotting factors in normal condition
  
• D. None of the above

Answer 1

The correct option is C Absence of active clotting factors in normal condition

In blood, platelets produce thromboplastin only at the site of injury and not in the normal condition which initiates the process of blood clotting. There is an another factor or protein called fibrinogen. When it makes contact with oxygen, it polymerizes to fibrin wires, creating a heap of fibrin wires, in which the various blood cells get caught, thus clogging the wound. Because all the oxygen in the blood is already bound to haemoglobin (red cells), it can't interact with the fibrinogen, thus cannot create a clot. Thus, the correct answer is option C.