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The Sinoatrial (SA) node and the Atrioventricular (AV) node are both extremely important in the conduction events of the heart. The Sinoatrial node displays pacemaker activity - that is, it spontaneously depolarizes, setting in forth the chain of events that is required for contraction of the heart. Depolarization refers to the event in which positive ions flow into the heart, resulting in a voltage change in the heart, leading to contraction. From the SA node, the voltage is conducted through the internodal pathway to the AV node, in which the impulse is temporarily paused before been transmitted through the Bundle of His and the Left and Right bundle branches. These events, as previously mentioned, are extremely important in conduction pathways of the heart, and hence, the function of the heart :)

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What is the main pace maker of the heart?

The primary pacemaker of a normal healthy heart is the sinus node (or SA node). It is located in the right atria of the heart.


What pacemaker of the heart initiates depolarization under normal conditions?

The primary pacemaker of the mammalian heart is the sino-atrial node. If the SA node fails, the atrioventricular node (AV node) takes over pacemaking.


Correct order of intrinsic cardiac conduction?

Its one of these, cant remember which one though: AV node, SA node AV bundle, Purkinje fibres. SA node, AV bundle, Purkinje fibres, AV node. SA node, AV node, AV bundle, Purkinje fibres. Purkinje fibres, SA node, AV node, AV bundle.


If the SA node fails to fire what takes over?

If the SA node fails to fire the atrioventricular node should take over.


Where in the heart would the SA node be found?

The anterior, upper part of the right atrium.The Sinoatrial Node or SA Node is located in the right Atrium of the Heart. The SA node is responsible of the normal sinus rhythm.


What node triggers the impulse in the heart?

SA node


Is the peacemaker of the heart the atrioventricular node?

NO! it is the SA Node..


What causes the SA node to fire?

The autonomic nervous system causes the SA node to fire


What is the sa node?

The SA node is the "pacemaker" of the heart. Cells in the SA node are called "pacemaker" cells and they direct the contraction rate of the entire heart by generating action potentials.


What is the SA node known as?

SA = System Annoyance


The SA node triggers an impulse that causes both atria to do what?

SA node sends an impulse for the atria to contract. AV node is then activated which contracts the ventricles.


Where is the cell body that causes SA node cells to depolarize faster?

The sinoatrial (SA) node, also known as the pacemaker of the heart, is the region of the heart where cells depolarize spontaneously to generate electrical impulses. The specific location of the SA node's cell bodies is within the right atrium, near the opening of the superior vena cava.