KROK 1 Stomatology 2014 – Question 184 · KROK (Dentistry)
After a patient had taken a blocking agent, his heart rate (HR) increased. Pressing on the eyeballs didn’t result in the expected reflectory decrease in heart rate. What exactly was blocked by the drug in the pacemaker cells?
- A. β-adrenergic receptors
- B. M-cholinergic receptors
- C. α1-adrenergic receptors
- D. Ca²⁺ L-type channels
- E. Fast Na⁺ channels
Hint
The oculocardiac (Aschner) reflex slows the heart via the vagus nerve, so think about which receptor on sinoatrial pacemaker cells mediates the vagal effect.
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