KROK 1 2011 – Question 3 · KROK (Medicine) · Physiology
Heart rate of a 30-year-old man under emotional stress reached 112 bpm. The reason for the heart rate increase is the altered condition of the following conducting system of heart:
- A. Purkinje’s fibers
- B. Sinoatrial node
- C. Atrioventricular node
- D. His’ bundle branches
- E. His’ bundle
Hint
Think about which part of the conduction system normally determines the heart rate and is the target of sympathetic influence during stress.
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