Question

The pace setter in the heart is called as

• A. AV node
• B. SA node
• C. Purkinje fibres
• D. Papillary muscles

Answer 1

The correct option is A AV node

The cardiac impulse is initiated in the sinoatrial node also known as the natural pacemaker. It then travels to the atrioventricular node. From there through the Purkinje fibres to the ventricles. The atrioventricular node regulates the rhythm of the heart rate mainly. The delay in conduction of impulse in this node changes the duration of contraction between the atria and the ventricles. Hence, AV node is called as the pace-setter.

So, the correct answer is option A.