Question

Which of the following heart tissues is known as the pacemaker?

• A. Sinoatrial node
• B. Atrioventricular node
• C. Purkinje fibres
• D. His bundle

Answer 1

The correct option is A

Sinoatrial node

The correct option is A.

The explanation for the correct answer :

1. The Sinoatrial node or SA node is referred to as the natural pacemaker of the human heart.
2. SA node transmits impulses originating in the right atrium to the atrioventricular node (AVN).
3. It helps in maintaining the rhythmicity of the heart.

The explanation for the incorrect options:

Option B

The atrioventricular node helps in the transmission of impulses received from the SA node to the ventricles.

Option C

They receive the impulses from the atrioventricular node and pass them on to the interventricular septum before the division occurs.

Option D

Bundle of His help in conduction of impulses within the heart muscles. They receive the impulses from the AV node and distribute them to the bundle branches and Purkinje fibres.

Final answer: Sinoatrial node in the heart is known as Pacemaker.