Sinoatrial node: The heart's natural pacemaker, one of the major elements in the cardiac conduction system, the system that controls the heart rate. The SA node consists of a cluster of cells that are situated in the upper part of the wall of the heart's right atrium, where the electrical impulses are generated. Medical Definition of SA node. The SA node is the heart's natural pacemaker. The SA node consists of a cluster of cells that are situated in the upper part of the wall of the right atrium (the right upper chamber of the heart). The electrical impulses are generated there. The SA node is also called the sinus node. Looking for online definition of SA node in the Medical Dictionary? SA node explanation A study on anatomy and variations of sinoatrial nodal artery. Caption.
The cells of the SA node are spread out within a mesh of connective This means that the SA node cells are less equipped to Structure - Function - Nerve supply - Clinical significance. noun, Anatomy. 1. a small mass of tissue in the right atrium functioning as pacemaker of the heart by giving rise to the electric impulses that initiate heart contractions. Expand. Also called sinus node. 3 Oct (Science: anatomy, cardiology, physiology) The impulse generating normal impulses start in the sinoatrial node and are transmitted to the.
Definition of sino-atrial - relating to or denoting a small body of specialized muscle tissue (the sino-atrial node) in the wall of the right atrium of the he. The sinoatrial node is the primary pacemaker of the heart. to define the mechanisms behind closure of the SAN—nodal tissue, defined by the presence of. 24 Oct The sinoatrial node and the atrioventricular node control electrical impulses OpenStax, Anatomy & Physiology/Wikimedia Commons/CC BY Attribution A faster heart rate means that blood and oxygen are delivered to.