Apr 24, 2023 · The cardiac conduction system is a collection of nodes and specialised conduction cells that initiate and co-ordinate contraction of the heart muscle. It consists of: Sinoatrial node; Atrioventricular node; Atrioventricular bundle (bundle of His) Purkinje fibres

Jan 17, 2025 · Sinoatrial node. Your sinoatrial (SA) node is your heart’s natural pacemaker. It sends the electrical impulses that start your heartbeat. When your sinoatrial node isn’t working well, the lower segments of your conduction system act as backup pacemaker cells. The SA node is in the upper part of your heart’s right atrium.

Aug 17, 2023 · Although all parts have the ability to generate action potentials and thus heart contractions, the sinuatrial (SA) node is the primary impulse initiator and regulator in a healthy heart. This aspect makes the SA node the physiological pacemaker of the heart.

Oct 3, 2022 · The main function of the SA node is to act as the heart's normal pacemaker. It initiates an action potential that results in an electrical impulse traveling through the heart’s electrical conduction system to cause myocardial contraction.

The heart's pumping action is regulated by an electrical conduction system that coordinates the contraction of the various chambers of the heart. How does the heart beat? An electrical stimulus is generated by the sinus node (also called the sinoatrial node, or SA node).

Oct 30, 2023 · The sinuatrial node is one of several structures of the cardiac conduction system. This intrinsic conduction system generates impulses for the contractions of the heart and ensures the coordinated flow of blood through the chambers of the heart.

The sinoatrial node (also known as the sinuatrial node, SA node, sinus node or Keith–Flack node) is an oval shaped region of special cardiac muscle in the upper back wall of the right atrium made up of cells known as pacemaker cells.

May 10, 2020 · An overview of the cardiac conduction system including the sinoatrial node, atrioventricular node, the bundle of His and Purkinje fibres.

May 23, 2023 · The nodal cells are organized into two clusters, or nodes, called the sinoatrial (SA) node and atrioventricular (AV) node. The SA node is the one that generates the impulses which are then propagated to the atria of the heart and to the AV node.

The conduction system of the heart. Left: Normal excitation originates in the sinoatrial (SA) node then propagates through both atria. The atrial depolarization spreads to the atrioventricular (AV) node, and passes through the bundle of His to the bundle branches/Purkinje fibers.