NEETZoologyBody Fluids and Circulation
With respect to the diagram shown, match the flow of fibres / action potential in heart muscle.
Options
- AA to B to C
- BB to A to C
- CC to A to B
- DC to B to A
Correct answer
B. B to A to C
Step-by-step solution
The entire heart is made of cardiac muscles. The walls of ventricles are much thicker than that of the atria. A specialised cardiac musculature called the nodal tissue is also distributed in the heart. 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, atrio- ventricula