Confused and have questions? We’ve got answers. With Chegg Study, you can get step-by-step solutions to your questions from an expert in the field. If you rather get 1:1 study help, try 30 minutes of free online tutoring with Chegg Tutors.


From Biology-Online Dictionary | Biology-Online Dictionary
Jump to: navigation, search

node, sa

sinoatrial node. The pacemaker of the heart, located in the right atrium (upper chamber of the heart). The electrical signals initiated in the sa node are transmitted through the atria and the ventricles to stimulate heart muscle contractions (heartbeats).