# Which of the following is the strongest activator of platelet?
a. Thrombin
b. Serotonin
c. Thromboxane A2
d. Epinephrine
The correct answer is: A. Thrombin.
Strong activator: Thrombin Collagen ADP, Shear
Weak: Epinephrine
Thromboxane A2/Prostoglandin H2
Serotonin
Platelet activating factor
Vasopressin Thrombospondin-1
Thrombolytic agent
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