NEETZoologyBody Fluids and Circulation
What is the role of SAN in the human heart?
Options
- ATo separate the right and left atria
- BTo prevent backward flow of blood
- CTo initiate and maintain rhythmic contractile activity
- DTo divide into right and left bundle
Correct answer
C. To initiate and maintain rhythmic contractile activity
Step-by-step solution
A patch of this tissue is present in the right upper corner of the right atrium called the sino-atrial node (SAN). Another mass of this tissue is seen in the lower left corner of the right atrium close to the atrio-ventricular septum called the atrio-ventricular node (AVN). A bundle of nodal fibres, atrioventricular bundle (AV bundle) continues from the AVN which passes through the atrio-ventricular septa to emerge on the top of the interventricular septum and immediately divides into a right and left bundle.These