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If the AV node could no longer do its job, I think that the ventricles would not be able to contract. The blood could not move to the lungs, nor could it move back. If the AV node could no longer do its job, it would be equivalent to only the top half of the heart working. If only the top half of the heart is working, which means blood is coming from the body into the right atrium, and then the atrium pumps blood into the right ventricle. The ventricle would be swollen because it could not hold so much deoxygenated blood, and eventually, burst. This is because, if the ventricle could not contract, that means there is no way that the ventricle can empty itself out. If the AV node could no longer do its job, then the only part of the heart that would contain blood in it would be the right ventricle, until there is no longer any blood in the body. All of the body's blood would be deoxygenated and in the right ventricle because deoxygenated blood is coming back from the body to the right atrium, and the atrium is contracting, allowing blood into the right ventricle, but no oxygenated blood is leaving the heart, eventually putting all of the blood from the body into the right ventricle. This would eventually lead to death.
When the sinoatrial node, the pacemaker of the heart, fails, the atrioventricular node takes over as pacemaker. It is located between the atria and ventricles in the heart. It paces the heart at about 60 beats per minute.
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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.
Why the sino atria node is regarded as a pacemaker in the heart?
The sinoatrial, or SA, node is known as the pacemaker of the heart. There are other potential pacemakers if the SA node fails, but it is the main pacemaker.
What first causes the sinoatrial node to begin in a fetus' heart?
The sinoatrial node is a part of the electrical system of the heart. The development of the sinoatrial node is from the sinus horn myocardium in fetal development.
The node that directly controls contraction of the atria is?
Sinoatrial node
What node triggers and impulse?
The sinoatrial node triggers an impulse
Is AV NODE known as pacemaker?
No, it is the SAN (sinoatrial node)
The sinoatrial node is the heart's?
... pacemaker.
What is the peacemaker of the myocardium?
sinoatrial node
Is sinoatrial node called a pacemaker?
yes
A heartbeat begins with an impulse from the?
In the Sinoatrial Node
What conducting cells set heart rate?
Sinoatrial Node (SA node)
Is the pacemaker of the heart under normal circumstances is called the sinoatrial SA node?
Yes the sinoatrial node is also called the pacemaker under all circumstances
