1.

Label parts A’ and ‘B’ from the given diagram and give their functions.

Answer»

Part A → Sinoatrial [SA] node Function : SA node acts as pacemaker of heart because it has the power of generating a new wave of contraction and making the pace of contraction. 

Part B → Atrioventricular [AV] node Function : Atrioventricular [AV] node acts as pace-setter of heart.



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