A) AV Node
B) SA Node
C) Node of Ranvier
D) Chordae tendineae
Correct Answer: B
Solution :
: Sino atrial node (SA node) is the pacemaker of the heart. It is a microscopic area of specialized cardiac muscle located in the upper wall of the right atrium near the entry of the vena cava. Fibres of the SA node are self excitatory, contracting rhythmically at around 70 times per minute. Following each contraction, the impulse spreads throughout the atrial muscle and into fibres connecting the SA node with the atrioventricular node. The SA node is supplied by fibres of the autonomic nervous system; impulses arriving at the node accelerate or decrease the heart rate. So it is also called heart of heart.
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