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Questions and Answers
What triggers the vascular spasm during hemostasis?
What triggers the vascular spasm during hemostasis?
- Pain receptors activation (correct)
- Aggregation of platelets
- Chemicals released by endothelial cells
- Serotonin release
What is the first stage of hemostasis?
What is the first stage of hemostasis?
- Coagulation
- Serotonin release
- Aggregation of platelets
- Vasoconstriction (correct)
What is the function of platelet plug in hemostasis?
What is the function of platelet plug in hemostasis?
- Induce vasoconstriction
- Prevent bleeding and stop hemorrhage (correct)
- Activate coagulation factors
- Promote blood vessel dilation
What speeds up the formation and propagation of the platelet plug during hemostasis?
What speeds up the formation and propagation of the platelet plug during hemostasis?
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What do activated platelets become adhesive to during hemostasis?
What do activated platelets become adhesive to during hemostasis?
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Study Notes
Hemostasis Process
- Thromboxane A2 and epinephrine trigger vascular spasm during hemostasis
Stages of Hemostasis
- The first stage of hemostasis is vasoconstriction, which reduces blood flow to the injured area
Platelet Plug Function
- The platelet plug, also known as a platelet thrombus, physically seals the wound or injured blood vessel, preventing further blood loss
Platelet Plug Formation
- Thromboxane A2 and collagen exposed at the site of injury speed up the formation and propagation of the platelet plug during hemostasis
Platelet Adhesion
- Activated platelets become adhesive to collagen and von Willebrand factor, leading to platelet aggregation and plug formation
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