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Questions and Answers
What is the first stage of hemostasis?
What is the first stage of hemostasis?
- Secretion of chemicals inducing blood vessel dilation
- Coagulation
- Aggregation of platelets/Platelet plug
- Vasoconstriction/Vascular spasm (correct)
What do activated platelets do in the second stage of hemostasis?
What do activated platelets do in the second stage of hemostasis?
- They become adhesive to each other and to the endothelium (correct)
- They secrete chemicals inducing blood vessel dilation
- They stimulate the formation of blood clots
- They form coagulation sites
What serves as the site for coagulation in the third stage of hemostasis?
What serves as the site for coagulation in the third stage of hemostasis?
- The platelet plug
- The surface of activated platelets (correct)
- The blood vessels
- The endothelium
What triggers vasoconstriction or vascular spasm in hemostasis?
What triggers vasoconstriction or vascular spasm in hemostasis?
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What is the main function of the platelet plug in hemostasis?
What is the main function of the platelet plug in hemostasis?
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Study Notes
Hemostasis Stages
- The first stage of hemostasis is vasoconstriction or vascular spasm, which reduces blood flow to the injured area.
Second Stage of Hemostasis
- Activated platelets release chemical signals that attract more platelets to the site, forming a platelet plug.
- Activated platelets also change shape, becoming spiky and sticky, to aggregate with each other and with the vessel wall.
Third Stage of Hemostasis
- Fibrin clot formation occurs at the site of injury, which serves as the site for coagulation.
Hemostasis Regulation
- Thromboxane A2 and endothelins trigger vasoconstriction or vascular spasm in hemostasis, reducing blood flow to the injured area.
Platelet Plug Function
- The main function of the platelet plug in hemostasis is to temporarily stop bleeding, allowing the blood to clot and the vessel to heal.
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