Go through the following statements   (i) The inner surface of atria have got transverse
Channel: Doubtnut
Date: 2020-04-26

Go through the following statements   (i) The inner surface of atria have got transverse muscular ridges called papillary muscles.  (ii) Chordae tendinae are special fibrous cords attached to the AV valves and prevent them from collapsing back into the atria during powerful vantricular contraction  (iii) The neurogenic heart stops functioning immidiately after removal from the body.  (iv) The conduction of cardiac impulse is slowest in the A.V. node.  Which of these are correct ?