A) Purkinje fibres
B) papillary muscles
C) SA-node
D) AV-node
Correct Answer: C
Solution :
The contraction of heart depends on small cluster of specialised muscle cells which are embedded in the upper wall of the right atrium. This cluster of cells is called the sino- atrial node (SA-node). It automatically and rhythmically sends out impulses that initiate each heart beat.
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