MRCP UK EXAMINATIONS

Detailed explanation-1: -The mechanism of hemostasis can divide into four stages. 1) Constriction of the blood vessel. 2) Formation of a temporary “platelet plug.” 3) Activation of the coagulation cascade. 4) Formation of “fibrin plug” or the final clot.

Detailed explanation-2: -Respectively, each one is named, fibrinogen, prothrombin, Christmas factor, Stuart-Prower factor, plasma thromboplastin, and Hageman factor. The extrinsic pathway consists of factors I, II, VII, and X. Factor VII is called stable factor.

Detailed explanation-3: -Prothrombin is also known as factor II (factor two). Blood clotting normally occurs when there is damage to a blood vessel. Platelets immediately begin to adhere to the cut edges of the vessel and release chemicals to attract even more platelets. A platelet plug is formed, and the external bleeding stops.

Detailed explanation-4: -The two key players in the common pathway are thrombin and fibrin. Fibrin is the most important part of the clotting cascade because fibrin is what traps the platelets, and is therefore clotting factor number 1.