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Questions and Answers
What role does intact endothelium play in the coagulation process?
Which of the following statements about nitric oxide is true?
What is the primary function of adenosine diphosphatase expressed by endothelial cells?
Which enzyme is responsible for the production of both prostacyclin and thromboxane A2 from arachidonic acid?
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Which substance is produced by activated platelets and has the opposite effect compared to prostacyclin?
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Study Notes
Endothelial Function in Hemostasis
- Intact endothelium acts as a barrier preventing platelet and plasma coagulation factor contact with subendothelial collagen, which is highly thrombogenic.
- Endothelial cells secrete Prostacyclin (PGI2) and nitric oxide, both of which play critical roles in vascular health and platelet inhibition.
- The synthesis of PGI2 and nitric oxide is stimulated by various factors released during the coagulation process.
Key Endothelial Mediators
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Prostacyclin (PGI2)
- Produced by vascular endothelial cells and has a potent anti-platelet effect.
- Synthesized from arachidonic acid via the Cyclooxygenase (COX) enzyme.
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Nitric Oxide (NO)
- Functions as a vasodilator and inhibits platelet activation.
- Also synthesized from arachidonic acid through COX activity.
Platelet Regulation
- Endothelial cells express adenosine diphosphatase, an enzyme that degrades adenosine diphosphate (ADP).
- The degradation of ADP further inhibits platelet aggregation, enhancing the anti-thrombotic environment of the endothelium.
Thromboxane A2
- Thromboxane A2 is produced by activated platelets and promotes platelet aggregation, acting oppositely to PGI2.
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Description
This quiz explores the role of intact endothelium in preventing platelet activation and coagulation. It covers the secretion of substances like Prostacyclin (PGI2) and nitric oxide that maintain vascular health and inhibit platelet aggregation. Test your understanding of these crucial biological processes.
