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  4. The rate of heart beat is determined by

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Q. The rate of heart beat is determined by

J & K CETJ & K CET 2013

Solution:

The rate of heart beat is determined by $SA$ node or sinoatrial node of myogenic muscles. These muscle from two nodes and a network called cardiac conduction system. $SA$ node is a site of rhythmic impulse so is also called as pacemaker.