Question
S.A. Node and A.V. Node.

Answer

S.A. NodeA.V. Node
1. Sinoatrial node is present in the right ventricle near the opening near the opening of the superior vena cava.1. Atrioventricular node is present in the right ventricle near the opening of the coronary sinus.
2. S.A. node is the pacemaker of the heart and it starts atrial systole.2. A.V. node starts ventricular systole through bundles of His and Purkinje’s fibre system.

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