(A) $SA-$node (sino-atrial node) is a group of specialized cardiac muscle cells,which have the property of generating rhythmic excitatory waves.It is

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(A) $SA-$node (sino-atrial node) is a group of specialized cardiac muscle cells,which have the property of generating rhythmic excitatory waves.It is also called the pacemaker of the heart as it generates the electrical impulse for all the chambers of the heart to contract.