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Haleyevette Haleyevette
wrote...
Posts: 722
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6 years ago
What substance is known to inactivate cyclooxygenase, causing impairment of platelet function?
 
  a. Aspirin
  b. Calcium
  c. Tylenol
  d. Vitamin K
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Replies
wrote...
6 years ago
ANS: A
Aspirin inactivates the enzyme cyclooxygenase, blocking thromboxane A2 production and causing impairment of platelet function (called aspirin effect). Thromboxane A2 causes Ca+2 to be released and promotes platelet aggregation and vasoconstriction.
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