Multiple choice

Which of the following does not characterise a mammalian heart?

  1. In a human heart, a single heartbeat lasts for about 0.8 seconds.

  2. The impulses are delayed for about 0.1 s at the bundle of his.

  3. The SA node generates electrical impulses.

  4. Few cardiac cells can contract without any signal from the brain.

  5. The heart is energetically a syncytium.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is incorrect as the atrioventricular node is located in the wall between the right atrium and the right ventricle. 

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