A nursing student asks the nurse to explain the role of cyclooxygenase-2 (COX-2) and its role in inflammation. The nurse will explain that COX-2
a. converts arachidonic acid into a chemical mediator for inflammation.
b. directly causes vasodilation and increased capillary permeability.
c. irritates the gastric mucosa to cause gastrointestinal upset.
d. releases prostaglandins, which cause inflammation and pain in tissues.
ANS: A
COX-2 is an enzyme that converts arachidonic acid into prostaglandins and their products, and this synthesis causes pain and inflammation. They do not act directly to cause inflammation. COX-1 irritates the gastric mucosa. COX-2 synthesizes but does not release prostaglandins.
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