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Describe the process of blood clotting
When a blood vessel is cut/injured, the platelets/thrombocytes at the damaged tissue/wound are exposed to the air; they release thrombokinase/thromboplastin; an enzyme that activates the conversion of prothrombin; to thrombin; in the presence of calcium ions; vitamin K; is needed for the formation of prothrombin; Thrombin converts (soluble blood protein) fibrinogen; into (the fibrous form) fibrin; which forms a meshwork across the wound; The clot so formed prevents excessive bleeding; and entry of pathogens/micro-organisms;
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