which regulates heart beat .?
A)purkinjee fibres B)cardiac branch of vagus nerve C)sa node D)av node .,exp ur ans clearly
The SA node
As this group of fibres are located at right atrium which is also called as the pace maker of the heart, which help in increasing or decreasing whenevr it is needed
As this group of fibres are located at right atrium which is also called as the pace maker of the heart, which help in increasing or decreasing whenevr it is needed