E. agglutination 27. During platelet plug formation, A. platelets stick to the e

Question

E. agglutination 27. During platelet plug formation, A. platelets stick to the exposed collagen fibers of injured vessels B. activated platelets release fibrinogen. C. thrombin is released from endothelial cells. D. vitamin K production increases. E. platelets multiply. 28. In the platelet release reaction, A. factor XII is activated. B. ADP and thromboxanes stimulate other platelets to become activated. C. activated platelets are connected by fibrinogen. D. prostaglandin production is inhibited. E. platelets convert to fibrin. uents is one of the three main stages of coag

Explanation / Answer

27. Platelet plug formation: It is second stage of homeostasis. When blood vessels get injured, platelets adhere to the exposed collagen and von Willebrand factor(vWF).

Answer: A

28. Platelet plug formation occurs in 3 stages:

a. Platelet adhesion: When blood vessels get injured, platelets adhere to the exposed collagen and von Willebrand factor(vWF).

b. Platelet activation: Platelets activations are induced due to factors like:

Adhesion to proteins like collagen, serotonin, epinephrine, platelet activation factor (PAF).

c. Platelet aggregation: aggregation of platelets occurs at site of injury, on encountering factors like thromboxane and ADP. These leads to activation of other platelets.

Answer: B

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