BLOOD CLOTTING

Introduction: Coagulation, also known as clotting, is the process by which blood changes from a liquid to a gel, forming a clot also sometimes refered to as a platelet plug. It potentially results in hemostasis, the cessation of blood loss from a damaged vessel, followed by repair. The mechanism of coagulation involves activation, adhesion, and aggregation of platelets along with deposition and maturation of fibrin.  Disorders of coagulation are disease states which can result in bleeding that presents as hemorrhage or bruising, or obstructive clotting that leads to thrombosis.

Benefits of blood clotting: Coagulation is highly conserved throughout biology and in all mammals, coagulation involves both a cellular process involving platelets and a protein cascade which in that case are the coagulation factors. Coagulation begins almost instantly after an injury to the blood vessel has damaged the endothelium lining the vessel. Exposure of blood to the space under the endothelium initiates two processes: changes in platelets, and the exposure of sub-endothilial tissue factor to plasma. Factor VII, which ultimately leads to fibrin formation. Platelets immediately form a plug at the site of injury. This is called primary hemostasis. Secondary hemostasis occurs simultaneously: Additional coagulation factors or clotting factors beyond Factor VII respond in a complex cascade to form fibrin strands, which strengthen the platelet plug.

RELATED;

1.  Composition of blood

2.  The coagulation cascade

3.  The ABO blood grouping

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