KROK 1 2009 – Question 151 · KROK (Medicine) · Physiology
During an experiment vagus branches that innervate heart are being stimulated. This has stopped conduction of excitement from the atria to the ventricles. The reason for it are electrophysical changes in the following structures:
- A. Atrioventricular node
- B. Ventricles
- C. Sinoatrial node
- D. Atria
- E. His’ bundle
Hint
Vagal acetylcholine mainly acts on tissue with slow, calcium-dependent action potentials; ask which part of the pathway carrying excitation between the heart chambers has this property.
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