KROK 1 Stomatology 2013 – Question 27 · KROK (Dentistry)
Functioning of certain structures of the isolated heart was stopped by means of cooling. What structure was cooled providing that the heart first stopped contractions and then resumed them with a frequency twice lower than the initial one?
- A. Purkinje’s fibers
- B. Sinoatrial node
- C. Atrioventricular node
- D. His’ bundle branches
- E. His’ bundle
Hint
Consider which part of the conduction system is the primary pacemaker and which part takes over, at what intrinsic rate, when it fails.
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