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What controls rate of heartbeat?
the SA node
The rate and pace of the heart is set by what?
The rate and pace of the heart are set by the SA node. There are backup systems in place if the SA node fails to do its job.
What conducting cells set heart rate?
Sinoatrial Node (SA node)
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 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.
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 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.
The SA node is the normal pacemaker of the heart because the SA node?
depolarizes to its threshold potential before other pacemakers in the heart
Why is SA node called the pacemaker of the heart?
The SA node normally functions as the pacemaker for the entire heart because its intrinsic rate is the fastest in the system. From the SA node, impulses spread out over the atria, causing them to contract.
What is the intrinsic rate of sa node?
The sinoatrial node has an intrinsic rate of about 100 beats per minute, but it is normally down regulated by the vagus nerve.
If there is a complete block between the SA node and the AV node how would the ECG be affected?
The rate of P waves will be faster than the rate of QRS complexes.
SA node versus AV node?
1) Sino-atrial node is master node and atrio-ventricular node is on the path from SA node to impulse to ventricles. 2) SA node has intrinsic rhythme rate of about 72 beats/ minute and AV has intrinsic rhythme rate of about 50 beats per minute. 3) SA node has autonomic ( sympathetic and parasympathetic ) nerve supply and AV node do not have any such supply. 4) SA node regulates the heart rate and AV node slows down the conduction across the path, so that atria gets time to contract, to be fallowed by contraction of ventricles. 5) Disease of the SA node generally leads to sick sinus syndrome. Disease of the AV node generally leads to atrioventricular block.
