Q. In higher vertebrates, SA-node helps in
A) Conduction of blood
B) Initiation of heart beat
C) Opening of tricuspid valve
D) Opening of bicuspid valve
Explanation
Sinu-auricular Node (SA-node) or pacemaker is found in right auricle of heart. This initiates heart beat.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.