The term "sinoatrial node" refers to a small group of cells located in the heart that act as the natural pacemaker. It sends electrical signals to make the heart rhythmically contract and pump blood throughout the body. Full definition
Tohno Y, Tohno S, Viwatpinyo K, Minami T, Chaisuksunt V, Mahakkanukrauh P, Quiggins R. Age - related changes of elements in the human sinoatrial nodes. (oapublishinglondon.com)
Just a glimpse of the challenge comes from graduate student Sandra Grijalva's late breaking oral abstract describing «Induced Pacemaker Spheroids as a Model to Reverse - Engineer the Native Sinoatrial Node», which was presented yesterday. (emoryhealthsciblog.com)
That would be a bundle of nerves called the sinoatrial node. (discovermagazine.com)