All NSAIDs block cycloxygenase and
**Core Concept**
NSAIDs (Non-Steroidal Anti-Inflammatory Drugs) are a class of medications that inhibit the production of prostaglandins, which are mediators of inflammation and pain. They achieve this by blocking the enzyme cyclooxygenase (COX), which is responsible for converting arachidonic acid into prostaglandin H2, a precursor to various prostaglandins.
**Why the Correct Answer is Right**
The correct answer involves the mechanism of action of NSAIDs, which is to inhibit the COX enzyme. There are two main isoforms of COX: COX-1 and COX-2. COX-1 is constitutively expressed in most tissues and is responsible for the production of protective prostaglandins that maintain gastric mucosa and platelet function. COX-2, on the other hand, is inducibly expressed in response to inflammatory stimuli and is responsible for the production of pro-inflammatory prostaglandins. NSAIDs block both COX-1 and COX-2, but the blockade of COX-2 is more specific to the inhibition of inflammation and pain.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incomplete and does not provide a valid answer.
**Option B:** This option does not specify which aspect of COX is blocked.
**Option C:** This option is incorrect because it does not accurately describe the mechanism of action of NSAIDs.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that the blockade of COX-1 by NSAIDs can lead to gastrointestinal side effects, such as gastric ulcers and bleeding, due to the decreased production of protective prostaglandins in the gastric mucosa.
**Correct Answer:** None of the above