Multiple choice

Which conducting system of the heart is known as pacemaker?

  1. SA node

  2. AV node

  3. Bundle of His

  4. Arterioles

  5. Purkinje fibres
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A Correct answer
Explanation

Sino atrial node is a specialised cardiac tissue present at the junction of superior vena cava and right atrium. It generates the maximum number of impulses (70 to 80 per minute) and sets the pace for the heart. Hence, it is called pacemaker of the heart. The cardiac impulse originates at the SA node.

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