C oagulation of blood in vessels is prevented during normal circulation by

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C oagulation of blood in vessels is prevented during normal circulation by

question_subject: 

Science

question_exam: 

IES

stats: 

0,8,7,8,3,3,1

keywords: 

{'thromboplastin': [1, 0, 0, 0], 'prothrombin': [1, 0, 0, 0], 'normal circulation': [1, 0, 0, 0], 'heparin': [5, 0, 0, 1], 'blood': [5, 0, 0, 1], 'vessels': [1, 0, 2, 2], 'plasmogen': [1, 0, 0, 0]}

The correct answer is option 1 - heparin.

Heparin is a naturally occurring substance in the body that helps prevent blood clotting. It acts as an anticoagulant by inhibiting the activity of clotting factors involved in the coagulation cascade. By doing so, heparin prevents the formation of blood clots within the blood vessels, ensuring normal blood flow and circulation.

Option 2 - prothrombin, is a precursor protein that plays a crucial role in the blood clotting process. It is converted into thrombin, which then converts fibrinogen into fibrin, leading to the formation of a blood clot. Prothrombin is not involved in the prevention of blood clotting.

Option 3 - plasminogen, is a precursor protein that is involved in the breakdown of blood clots. When activated into plasmin, it breaks down the fibrin strands of a blood clot. Plasminogen is not directly involved in the prevention of blood clotting.

Option 4 - thromboplastin, is an enzyme that is released from damaged tissues and initiates the clotting process. It plays a role in promoting blood clot formation, not preventing it.

Therefore, the correct answer is 1 -