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Question

Which of the following is called the pacemaker of the heart?
  1. Sinoatrial node
  2. Atrioventricular node
  3. Purkinje fibres
  4. Bundle of His


Solution

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 sinoatrial node is located in the right atrium. It is also called the pacemaker

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. The atrioventricular node is situated between the right atrium and the right ventricle. Bundle of His is situated in the interventricular septa.
 

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