Blood clot formation



When the skin is cut and blood vessels are damaged, blood platelets are released. The exposed blood platelets rupture to release thromboplastin. This is also released by the damaged tissues. The thromboplastin together with Calcium ions and some plasma enzymes, convert the plasma protein, prothrombin to thrombin. This then converts soluble plasma protein known as tibrinogen to insoluble fibrin. The fibrins form a meshwork or network of fibres, which traps red blood cells and form a clot. This prevents excessive bleeding or lost of blood and entry of pathogenic microbes into the body through the cut. It also pulls cut surfaces together to speed up the healing of wounds.

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