E N C Y C L O P E D I A

Pacemaker

The heart pacemaker is a group of cells within the heart that together initiate contractions and set the pace of beating. For most people, this is a group of cells in the right atrium of the heart, otherwise known as the sinoatrial node.


Photographs, illustrations and Clip Art at Classroom ClipArt.com

This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.
   

Home       Clip Art      Games        Encyclopedia       Links     Educators Central      Lesson Plan Central