Which one of the following drugs will block the action of adrenaline?

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Question restatement: Which one of the following drugs will block the action of adrenaline?

Option 1: muscarinic antagonist
- This drug blocks muscarinic acetylcholine receptors, which are part of the parasympathetic system. Adrenaline (epinephrine) acts on adrenergic receptors, not muscarinic receptors, so a muscarinic antagonist does not block adrenaline's actions.

Option 2: sympathomimetics
- Sympathomimetics imitate or enhance sympathetic signals, often by stimulating adrenergic receptors. Using a sympathomimetic would not block adrenaline; it could even amplify some sympathetic effects, depending on context.

Option 3: selective beta 2 agonists
- A selective beta-2 agonist selectively activates beta-2 adrenergic receptors. Since adrenaline exerts effects via beta-adrenergic receptors among others, a beta-2 agonist would mimic certain actions of adrenaline rather than block them, and thus does not block adrenaline’s action overall.

Option 4: nonselective beta antagonists
- Nonselective beta antagonists (beta blockers) inhibit beta-adrenergic receptors (both beta-1 and beta-2). By occupying these receptors, they prevent adrenaline from eliciting its usual actions through those receptors, effectively blocking adrenaline’s effects at those sites.

In summary, the mechanism of action for blocking adrenaline is achieved by receptor blockade at the beta-adrenergic sites, which is accomplished by nonselective beta antagonists. Each of the other options targets different systems or receptors and would not prevent adrenaline from acting through its adrenergic receptors.

Which one of the following drugs will block the action of adrenaline?

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