Inflammation and repair · USMLE Step 1

Which mediator group derived from arachidonic acid plays a major role in inflammation (vasodilation, increased permeability, leukocyte chemotaxis)?

  1. Platelet-derived growth factors
  2. Thromboxanes, prostaglandins, leukotrienes
  3. Collagens and elastin fibers
  4. Keratinocyte growth factors
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Correct answer: Thromboxanes, prostaglandins, leukotrienes

Arachidonic acid metabolites — prostaglandins, thromboxanes and leukotrienes — are key inflammatory mediators that regulate vascular changes and leukocyte activity during inflammation.

Difficulty: Medium Question 17 of 22

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