THE HUMAN IMMUNE SYSTEM
TRANSFUSION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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vascular spasms constrict the flow of blood
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platelet plug forms, platelets adhere
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coagulation form fibers, scab forms
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thromus breaks away from vessel wall
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Detailed explanation-1: -The platelet plug formation is the second step of hemostasis. It occurs after vasoconstriction. During the process, platelets begin to accumulate, or aggregate, on the damaged vessel wall.
Detailed explanation-2: -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-3: -Primary hemostasis is when your body forms a temporary plug to seal an injury. To accomplish that, platelets that circulate in your blood stick to the damaged tissue and activate. That activation means they can “recruit” more platelets to form a platelet “plug” to stop blood loss from the damaged area.
Detailed explanation-4: -von Willebrand Factor: The factor responsible for causing platelet adherence and aggregation. It is increased by positive feedback during platelet activation.
Detailed explanation-5: -Following vasoconstriction, exposed collagen from the damaged surface will encourage platelets to adhere, activate and aggregate to form a platelet plug, sealing off the injured area.