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Atrioventricular (AV) node
The heart beats regularly because it has it's own pacemaker. The pacemaker is a small region of muscle called the sinoatrial, or SA, node. It is in the upper back wall of the right atrium. The node triggers an impulse that causes both atrium to contract. Very quickly, the impulse reaches the atrioventricular, or AV, node at the bottom of the right atrium. Immediately, the atrioventricular node triggers an impulse that causes both ventricles to contract.
ATRIOVENTRICULAR (AV) NODE; THIS DELAY IS IMPORTANT BECAUSE IT ENSURES THAT THE ATRIA HAVE EJECTED THEIR BLOOD INTO THE VENTRICLES FIRST BEFORE THE VENTRICLES CONTRACT. as found in easy notecards .com
NO! it is the SA Node..
the sinoatrial (SA) node is the "pacemaker" of the heart-it is the first stucture that makes up the conduction system of the heart-the system of electrical impulses that are discharged throughout the heart and cause rhythmic cardiac contractions and relaxations. impulse conduction starts in the SA node, causing the atria to contract, then goes to the atrioventricular (AV) node, the bundle of His, and then to the pukinje fibers which cause the ventricles to contract.
the AV node.
The Heart's own pace makerThe heart beats regularly because it has it's own pacemaker. The pacemaker is a small region of muscle called the sinoatrial, or SA, node. It is in the upper back wall of the right atrium. The node triggers an impulse that causes both atrium to contract. Very quickly, the impulse reaches the atrioventricular, or AV, node at the bottom of the right atrium. Immediately, the atrioventricular node triggers an impulse that causes both ventricles to contract.
sinoatrial node, right and left bundle branches, atrioventricular node, atrioventricular bundle, ventricular walls.
Atrioventricular (AV) Node
The sinoatrial node and the atrioventricular node controls the Cardiac Cycle- The Sinoatrial node is often called the Pace maker.The sinoatrial node is located in the wall of the right atrium. The Sinoatrial node emits a wave of electrical activity which reaches both Atria which causes them to contract, the wave of electrical activity is prevented from reaching the ventricles by the atrioventricular septum.Eventually the electrical activity will reach the Atrioventricular node which is situated between the atria.The Atrioventricular node conveys this along specialised muscle fibres called The Bundle of His.The bundle of his fibres release this electrical activity at the apex of the heart which causes both ventricles to contract at the same time.
No, the sino-atrial node is the pacemaker of the heart. It receives signals from the heart centre in the medulla oblingata via either the parasympathetic nerve or sympathetic nerve. It the sends a signal to the right- and left artrium and then to the atrioventricular node which stimulates the right- and left ventricles to contract
If the SA node fails to fire the atrioventricular node should take over.