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Sinoatrial node
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∙ 13y ago
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What structure conducts the contraction impulse from the atria to the ventricles?
the purkinje fibers um no!!! wrong answer!!
Does the AV node initiates the contraction of the atria?
No, the sinoatrial (SA) node initiates contraction of the atria, which subsequently causes stimulation of the AV node, which then initiates contraction of the ventricles via the Purkinje fibers.
What part of the heart is responsible for causing the rhythmic contraction of the atria and the ventricles?
the sinoatrial (SA) node
What is the importance of delay in the action potential in the AV node?
At the AV node, the impulse is delayed for about 0.1s, allowing the atria to respond and complete their contraction before the ventricles contract.
How long does the AV node delay the signal from the SA node?
The AV node delays the signal from the SA node, till the contraction of the atria is over. The delay period is about 0.1 second. The maximum limit for normal PR interval is 0.2 seconds.
Where is SAN located on the heart?
The sinoatrial node (SAN) is located within the walls of the right atrium. It is from here the initial stimulus for contraction of the atria originates.
What node triggers an im pulse that causes both atria to?
the atriventriculart node causes both atria to contract
What happens in a heart when an action potential is generated in the SA node?
It simulates the node, which then sends impulses to the AV node, which disperses these impulses through the cardiac muscle to cause a cardiac cycle (rhythmic beating and relaxing of atria and ventricles)
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.
Structure that carries the heart electrical impulse into the ventricle?
The atrioventricular (AV) node sends the signal to the AV bundle, where the wave of contraction travels from the atria to the ventricles.
What is The order of impulse conduction in the heart from beginning to end?
The impulse starts in the right atria in the sinus node, then travels through the intratrial fibers for atrial contraction, then travels down to the the av node where it is delayed, then travels down through the bundle branches to the purkinjee fibers to the ventricular myocardium for contraction.
What does the cardiac control center do?
The Cardiac Control Centre (CCC) is located in the brain, and controls the impulses created in the heart by the Synal Atrial node (SA node) as well as the impulses in the Atrioventricular node (AV node). The 'CCC' therefore controls systole in the atria and ventricles, and consequently heart rate is heightened or reduced based on the commands the Cardiac Control Centre gives out.
