During platelet plug formation, platelets begin to stick to
A. collagen with the assistance of von Willebrand factor.
B. prostacyclin with the assistance of activated factor V.
C. proconvertin with the assistance of factor IX.
D. collagen with the assistance of prothrombin.
E. prostacyclin with the assistance of thromboxane A2.
Answer: A
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1. calcium 2. carbon 3. potassium 4. phosphorus 5. lead 6. sodium A. P B. Na C. Ca D. C E. K F. Pb
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a. iris b. lens c. cornea d. sclera e. retina
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