A) Purkinje fibres
B) Papillary muscles
C) SA node
D) AV node
Correct Answer: C
Solution :
| [C] The contraction of the heart depends on a small cluster of specialized muscle cells which are embedded in the upper wall of the right atrium. This cluster of cells, called the sinoatrial node (SA node). It automatically and rhythmically sends out impulses that initiate each heartbeat. |
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