IMAT The heart and the cardiac cycle questions

Sample questions

1. 1IMAT Doutor

   In complete atrioventricular block, no impulse crosses from the atria to the ventricles. What is observed?
   1. AThe ventricles stop beating altogether, because they have no pacemaker tissue of their own, and death is immediate
   2. BAtria and ventricles both beat at the sinoatrial rate, but out of phase, because the impulse reaches the ventricles through the septum
   3. CThe heart rate rises, because the atrioventricular delay disappears and the ventricles are driven directly by the sinoatrial node
   4. DOnly the atria continue to beat, and the ventricles fill passively and empty only when atrial pressure pushes blood onward
   5. EThe atria beat at the sinoatrial rate and the ventricles beat independently, more slowly, driven by a pacemaker below the block
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