Question

Which of the following is called the pacemaker of the heart?

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

Answer 1

The correct option is A Sinoatrial node

The sinoatrial node is called the pacemaker of the heart as it sets the pace at which the heart beats. The electrical impulse generated by the sinoatrial node sets the pace at which the heart beats. It is located in the right atrium.

The electrochemical impulse generated by the sinoatrial node stimulates the atrioventricular node and the impulse is further carried to the two ventricles through the bundle of His and purkinje fibres from the atrioventricular node. The impulse causes the contraction of the auricles and ventricles.