About the sinoatrial node, which of the following descriptions are not correct?
A.It is known as the‘pacemaker’of the heart. B.It is located in the posterior wall of the left atrium. C.It is ellipse in shape. D.It generates an impulse at the rate of about 50/min. E.The impulse generated by the sinoatrial node travels through the internodal tract (结间束) to reach正确答案ACE
