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Hemostasis: Difference between revisions
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→Three Steps of Hemostasis
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== Three Steps of Hemostasis == | == Three Steps of Hemostasis == | ||
When a person's blood vessels are damaged, hemostasis begins its three steps to arrest bleeding. The three steps are a '''vascular spasm''', a '''platelet plug''', and a '''coagulation'''. The explanation of a vascular spasm and a platelet plug is followed. However, the explanation of | When a person's blood vessels are damaged, hemostasis begins its three steps to arrest bleeding. The three steps are a '''vascular spasm''', a '''platelet plug''', and a '''coagulation'''. The explanation of a vascular spasm and a platelet plug is followed. However, the explanation of coagulation will be located on the next section. | ||
• A vascular spasm | • A vascular spasm is a constriction of the damaged blood vessel which occurs at the site of injury. Vasoconstriction is initiated by the smooth muscle of the blood vessel in response to the injury and by nerve signals from pain receptors. | ||
• A platelet plug | • A platelet plug is consisting of a mass of linked platelets which fills the hole in the damaged blood vessel. Platelet plug formation follows these steps: | ||
a. Platelet adhesion. Platelets adhere to the exposed collagen fibers in the damaged blood vessel wall. | a. Platelet adhesion. Platelets adhere to the exposed collagen fibers in the damaged blood vessel wall. | ||
