A) coordinating electrical activity in the atria with electrical activity in the ventricles by connecting them via the boundle of His
B) having the AV node function as a secondary pacemaker
C) having an ectopic pacemaker
D) coordinating electrical activity in the atria with electrical activity in the ventricles by connecting them via the vagus nerve
Correct Answer: A
Solution :
The human heart has an intrinsic conducting system whereby the cardiac muscle is automatically stimulated to contract without the need for a nerve supply from the brain. The components of this system are (i) SA node This is small mass of cells located in right atrium. It is often-called pacemaker. It generates < electrical impulse. (ii) AV node Small mass of muscular tissue situated in wall of atria septum. Impulse is transferred to it from SA node. (iii) Bundle of His It consists of mass of specialized fibres that originate from AV node.
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