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process of blood clo

QuestionAnswer
Vasoconstriction • Localised contractioon of smooth muscle in small blood vessels is called vasoconstrictioon • Decreased blood flow to minimize blood loss and allows time for other responses
• Formation of a platelet plug • As soon as a blood vessel wall is damaged, aa series of reactions activates platelets so that they stick to the injured area of the blood vessel • The platelets change shape from round to spiny
• Formation of a platelet plug • Blood vessels that are damaged create a rough surface for platelets to stick This attracts other platelets forming a platelet plug • Chemicals are continued to be released that enhance vasoconstriction
• Blood clotting - Coagulation • Complex process that involves a large number of chemicals called clotting factors
• Clot retraction Platelets release a chemical that triggers a complex chemical pathway that causes fibrinogen to change its structure The fibrinogen is converted into threadlike protein fibres called fibrin
• Clot retraction 2 Fibrin is insoluble Fibrin threads form a mesh over the top of the platelet plug, that entraps red blood cell platelets and plasma to form the clot itself The fibrin threads stick to the damaged blood vessel wall and thus anchor the clot in place
blood component fibrin/firbinongen & clotting factors & platelets
Blood clotting coagulation - the formation of a blood clot
Blood clot mass of blood formed from blood platelets, proteins (clooting factors) & red blood cells sticking together
Why does blood clot Minimise blood loss when vessels are damaged Prevent entry of pathogens (agents which can cause disease) from entering the body
plattelets Platelets stick together to form a plug (not very strong) Becomes sticky when exposed to fibrin
Fibrinogen & fibrin Fibrinongen turns into fibrin when exposed to the outside world Fibrin - holds blood cells, platelets & plasma together in a mesh
Clotting factors Allows blood to clot proteins
Created by: procrast
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