Description : It causes clotting of blood - (1) Thrombin (2) Haemoglobin (3) Pectin (4) All of the above
Last Answer : (1) Thrombin Explanation: There are two major facets of the clotting mechanism - the platelets, and the thrombin system. The thrombin system consists of several blood proteins that, when bleeding occurs, become ... called fibrin. Red blood cells become caught up in the web, and a "red clot" forms.