Get Answers to all your Questions

header-bg qa

Pacemaker of the heart is situated 

 

Option: 1

In the wall of left atrium close to opening to pulmonary veins

 


Option: 2

In the wall of right atrium close to superior vena cava

 


Option: 3

On interauricular septum

 


Option: 4

On the interventricular septum

 


Answers (1)

best_answer
 

Conducting system of the human heart 

  • In human heart, small groups of specialised neuromuscular cells are present within the myocardium. 
  • These neuromuscular cells initiate and conduct nerve impulses due to which a coordinated and synchronised contraction of the heart muscles is seen
  • The components of conducting system of human heart includes sinoatrial node or SA node, Atrioventricular node or AV node, Bundle of His and Purkinje fibres

wherein,

  Sinoatrial node or SA node

  • It includes a mass of specialised self excitatory cells present in the wall of the right atrium near the opening of superior vena cava. 

  • SA node is also called as the pacemaker of the heart because of its involvement in the initiation of heartbeat impulses

  • SA node initiates impulses more rapidly than any other neuromuscular cells of heart.

Hence, the correct answer is option b.

Posted by

Riya

View full answer

NEET 2024 Most scoring concepts

    Just Study 32% of the NEET syllabus and Score up to 100% marks