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What conducting cells set heart rate?

Sinoatrial Node (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 is a atrioventrical node?

The atrioventricular node is a part of electrical control system of the heart that co-ordinates heart rate.


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.


How would damage to the sinoatrial node affect the heart's function?

The heart wouldn't beat at a constant rate.


What effect does have on heart rate?

The ANS auto-nomic-nerve system controlls heart rate and thus control the discharge rate of the sinus node


What are the negative chronotropic factors?

Chronotropes increase the human heart rate, sometimes by changing the rhythm of the sinoatrial node. Negative chronotropes decrease the heart rate.


Do neurotransmitters affect SA node?

Yes, neurotransmitters like acetylcholine and norepinephrine can influence the rate of firing of the sinoatrial (SA) node, which is the heart's natural pacemaker. Acetylcholine slows down the firing rate, while norepinephrine speeds it up, thus regulating heart rate.


The S-A node which initiates each cardiac cycle and sets the pace for the heart rate is also known as?

The Sinoatrial (SA) node, also known as the pacemaker of the heart, is responsible for generating electrical impulses that initiate each cardiac cycle and determine the heart rate. It is located in the right atrium of 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 result of parasympathetic stimulation of the SA node?

Parasympathetic stimulation of the SA node decreases heart rate by releasing acetylcholine, which hyperpolarizes the cells in the node and slows down the rate of depolarization. This stimulation is mediated by the vagus nerve, leading to decreased firing of action potentials and a slower heart rate.


What is the name for the specific part of the heart which sets the rate at which the heart will beat?

The pacemaker of the heart is known as the sinoatrial (SA) node. It sets the rate at which the heart will beat without any autonomic stimulation, that is, no sympathetic or parasympathetic activity. Increases in sympathetic activity will increase the heart rate while increases in parasympathetic activity decrease heart rate. The pacemaker of the heart is known as the sinoatrial (SA) node. It sets the rate at which the heart will beat without any autonomic stimulation, that is, no sympathetic or parasympathetic activity. Increases in sympathetic activity will increase the heart rate while increases in parasympathetic activity decrease heart rate. The pacemaker of the heart is known as the sinoatrial (SA) node. It sets the rate at which the heart will beat without any autonomic stimulation, that is, no sympathetic or parasympathetic activity. Increases in sympathetic activity will increase the heart rate while increases in parasympathetic activity decrease heart rate.