Multiple choice

In order to magnify the efficiency of contraction and cardiac output, the conduction system of a mammalian heart follows various mechanisms. Which of the following statements regarding the conduction system is incorrect?

  1. Depolarisation propagates through cardiac muscle very sluggishly.

  2. Temporary inactivation of certain ion channels helps heart in relaxation.

  3. The action potentials of cardiac muscle are unusually sustained.

  4. There is a substantial atrial to ventricular delay.

  5. There is a coordinated contraction of ventricular cells.
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A Correct answer
Explanation

Correct Answer: Depolarisation propagates through cardiac muscle very sluggishly.

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