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  4. Rate of heartbeat is determined by

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Q. Rate of heartbeat is determined by

Punjab PMETPunjab PMET 2010

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 heartbeat.