Multiple choice

Which of the following statements is correct regarding the conduction system of human heart?

  1. Between action potentials, the cells of the SA node have a steady resting potential.

  2. The cardiac action potential reaches both the atrium with the help of Purkinje fibers.

  3. The Purkinje fibers are particularised cardiac myocytes conjoined by gap unions.

  4. The diffusion of cardiac excitation accelerates at the AV node.
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C Correct answer
Explanation

This is the correct statement. In ventricles, the specialised conducting cells are the bundle cells and the Purkinje fibers, which transmit their action potentials to the ventricular myocytes via gap junctions.

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