What are nodal tissues ? Explain their role in heart beat.

1.	What are nodal tissues ? Explain their role in heart beat.
Answer» The heart beat results from a wave of electrical potential called the cardiac impulse, which originates from nodal tissue like sinu-atrial node (SAN), auricular ventricular node (AVN), bundle of His and Purkinje fibres. Functions : (i) SAN is located in the right auricle at the opening of the vena cavae. It is the part of the conducting system of heart. The stimulation arises initially in the sinu-atrial node. (ii) The AVN is located in the right auricle in the inter- auricular septum. It gives rise to bundle of His, a muscular bridge that conducts stimulation from the auricles to the ventricles. (iii) The bundle of His divides into two branches. The terminal branches of the conducting system are represented by a network of Purkinje fibres which convey stimuli to the myocardium.

Answer»

The heart beat results from a wave of electrical potential called the cardiac impulse, which originates from nodal tissue like sinu-atrial node (SAN), auricular ventricular node (AVN), bundle of His and Purkinje fibres.

Functions :

(i) SAN is located in the right auricle at the opening of the vena cavae. It is the part of the conducting system of heart. The stimulation arises initially in the sinu-atrial node.

(ii) The AVN is located in the right auricle in the inter- auricular septum. It gives rise to bundle of His, a muscular bridge that conducts stimulation from the auricles to the ventricles.

(iii) The bundle of His divides into two branches. The terminal branches of the conducting system are represented by a network of Purkinje fibres which convey stimuli to the myocardium.

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