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There are specialized areas of cardiac muscle tissue (1%) in the heart that are autorhythmic (self-exciting). These cells compose the CCS (Cardiac Conduction System) and are responsible for initiating and distributing cardiac (electrical) impulses throughout the heart muscle (cause the heart to beat).
These specialized areas together coordinate the events of the cardiac cycle, which makes the heart an effective pump. The main area called the Sinoatrial Node (S-A Node) is found in the right uppermost atrial wall. It is called the primary pacemaker producing a rhythmically and repeatedly [60-100 per minute] cardiac impulse.
Any damage to the S-A node will slow the heart rate. There is a secondary pacemaker called the A-V node. This pacemaker will continue the beat but at a slower rate.
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∙ 8y ago
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∙ 10y agoyes
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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.
Does the heart rate increase or decrease when the AV node is damaged?
my hear rate go up when i am up moving around
How would damage to the sinoatrial node affect the heart's function?
The heart wouldn't beat at a constant 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.
If the pacemaker cells in the SA node become more permeable to potassium ions the?
Both the heart rate will decrease and the membrane will hyperpolarize
When an individual experiences hypothermia which leakage channel in cells of the sinoatrial node become less permeable and cause the heart rate to decrease?
sodium channels
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.
Heartbeat is governed by what body system?
Heart muscles has there own rhythm of contraction. The sinoatrial node has the fastest rate of contraction. That is why it governs the rhythm of the heart. You have the control of the autonomic nervous system over the heart rate. Stimulation of the sympathetic nervous system increase the heart rate. Stimulation of the parasympathetic nervous system decrease the 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.
What component of fitness can lead to a decrease in resting heart rate?
Cardiovascular fitness can lead to a decrease in resting heart rate.
