<prompt> The following statements are ture regarding the SA node except -Is located at the right border of the ascending aortaIn contains specialized nodal cardiac muscleIt is supplied by the atrial branche of the right coronary arteryIt initiates cardiac conduction  <response>: SA node is supplied mostly by right coronary artery and beats at a rate of 70-80min. It is situated at upper end of crista terminalis in the right atrium. 