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  4. Impulse of heart beat originates from

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Q. Impulse of heart beat originates from

Rajasthan PMTRajasthan PMT 2007

Solution:

SA node (Sino Artial node) is a group of specialized cardiac muscle cells which have the property of generating rhythmic excitatory waves. It is also called pacemaker of the heart as it generates the wave for all the chambers of heart to contract.