Question

1. which statement is true regarding prostaglandins?

a. opioids block certain enzymes that makes them
b. formed by thermal reactions that cause pain and allows the healing process to begin
c. secreted from a gland
d. created only at the time they are needed where the problem exists

Explanation:

• Option A: NSAIDs (not opioids) block enzymes (like COX) involved in prostaglandin synthesis.
• Option B: Prostaglandins are formed via enzymatic reactions (not thermal) from arachidonic acid, related to inflammation/pain but formation isn't "thermal".
• Option C: Prostaglandins are not secreted from a gland; they are locally synthesized at the site of need.
• Option D: Prostaglandins are synthesized on - demand at the site of tissue injury or where physiological action is needed, matching their paracrine/autocrine action.

Answer:

D. Created only at the time they are needed where the problem exists