KROK 1 2009 – Question 69 · KROK (Medicine) · Physiology
In a healthy adult speed of the excitement conduction through the atrioventricular node is 0.02-0.05 m/sec. Atrioventricular delay enables:
- A. Sequence of atrial and ventricular contractions
- B. Simultaneity of both atria contractions
- C. Simultaneity of both ventricles contractions
- D. Sufficient force of ventricular contractions
- E. Sufficient force of atrial contractions
Hint
The node acts as a pause on the way from the upper to the lower chambers; consider what each pair of chambers can finish doing during that pause and in what order they work.
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