How does D-tubocurarine inhibit neuromuscular transmission?

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By antagonizing acetylcholine receptorsBy stopping the secretion of acetylcholineBy breaking down acetylcholine moleculesBy deactivating the enzyme acetylcholinesteraseNone of the above

Explanation

D-tubocurarine acts as a competitive antagonist at nicotinic acetylcholine receptors on the motor end plate, thereby blocking acetylcholine from binding and preventing muscle contraction. It does not affect acetylcholine release, degrade acetylcholine, or inhibit acetylcholinesterase.