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Explain the transmission of the electrical impulse within the heart from where it begins in the right atrium to where it ends within the ventricles?
The electrical impulse in the heart begins in the sinoatrial (SA) node and travels across the walls of the right atrium to the atrioventricular (AV) node. WHie the impulse travels the atria have time to contract. Once the impulse hits the AV node the signal is transmitted to the Bundle of His (AV bundle) and then on the the intraventricular fibers (purkinje fibers) in the septum and the outer chamber walls of the heart . This results in a simultaneous ventricular contraction.
What else can I help you with?
What causes the normal delay in transmission at the AV node What is the importance of this delay for cardiac function?
The delay occurs within the fibres of the AV node. It is important because it allows the atria to complete their contraction and empty their blood into the ventricles before the ventricles contract. There is a short delay (1 m/second) in transmission of the impulse to the ventricles.
What structure conducts the contraction impulse from the atria to the ventricles?
the purkinje fibers um no!!! wrong answer!!
Where does the electrical impulse of the heart get lost in the body?
the skin
How do you make your heart beat 400 times a minute?
You can't. The atrial cells, which control your heart rate, cannot fire that quickly. Even if they could, the atrioventricular node, which propagates the electrical impulse from the atria to the ventricles, does not allow the impulses to move through that quickly. There are some conditions, such as Wolff-Parkinson-White syndrome, in which there are bypass tracts around the AV node, that allow electrical activity directly down into the ventricle. In these conditions, the heart rate can approach 200 bpm - much higher than that, the ventricles begin to fibrillate, which is lethal.
Could the heart beat without the autonomic nervous system?
yes, the heart has its own pacemaker. The autonomic nervous system, while it can effect the heartbeat, cannot initiate it. That's the job of the Sinoatrial node located in the right atrium. It triggers an electrical impulse that travels down the right atrium, between the ventricles, and up the sides of the heart. This electrical impluse is what causes the heart to beat.
When does the human heart rest?
The electrical impulse reaches all the muscle tissue in the ventricles, and the ventricles contract. This electrical conduction pattern occurs approx. every 0.8 seconds.
What is the difference between synaptic and nerve impulse transmission?
Synaptic transmission is chemical, while nerve impulse or axonal transmission is electrical.
Structure that carries the heart electrical impulse into the ventricle?
The structure that carries the heart's electrical impulse into the ventricles is called the bundle of His. It is a collection of specialized muscle fibers located in the walls of the heart's chambers that conducts the electrical signal from the atrioventricular node to the ventricles, initiating their contraction.
When an electrical impulse reaches the AV node it is slowed for a brief period of time so that?
blood can pass from the atria to the ventricles.
What causes the normal delay in transmission at the AV node What is the importance of this delay for cardiac function?
The delay occurs within the fibres of the AV node. It is important because it allows the atria to complete their contraction and empty their blood into the ventricles before the ventricles contract. There is a short delay (1 m/second) in transmission of the impulse to the ventricles.
Which part of the heart delays the electrical impulse to allow for atrial emptying of blood before ventricular contraction?
The AV node slows down the impulse giving the atria time to contract before the ventricles contract.
Sequence of events in one heartbeat?
During one heartbeat, the sequence of events is as follows: 1) The sinoatrial (SA) node generates an electrical impulse, initiating the heartbeat. 2) The electrical signal spreads through the atria, causing them to contract and push blood into the ventricles. 3) The electrical signal reaches the atrioventricular (AV) node, which delays the impulse slightly to allow the ventricles to fill with blood. 4) The signal then travels down the bundle of His and Purkinje fibers, causing the ventricles to contract and pump blood out of the heart.
When does your heart get rest?
The electrical impulse reaches all the muscle tissue in the ventricles, and the ventricles contract. This electrical conduction pattern occurs approx. every 0.8 seconds.
At what structure in the transmission sequence is the impulse temporarily delayed and why?
The impulse is temporarily delayed at the atrioventricular (AV) node. This delay allows the atria to contract and complete the filling of the ventricles before the impulse is transmitted to them. The delay also ensures proper coordination of the heart's contractions, promoting efficient blood flow.
How does movement of electrical impulse relate to the contraction of the chambers of the heart?
The movement of electrical impulses in the heart coordinates the contraction of its chambers. The impulses initiate the contraction by stimulating the muscle cells, causing them to contract in a coordinated way. This results in the rhythmic pumping action that drives blood flow through the heart and to the rest of the body.
What is the difference between impulse conduction and transmission?
Impulse conduction refers to passage of impulse within the same cell. Where as transmission as the name implies, is concerned about passage of impulses either chemical or electrical from one cell to another.
What happens during the p-r interval?
During the P-R interval on an ECG, the electrical impulse travels from the atria to the ventricles through the AV node and the bundle of His. It represents the time it takes for the atrial depolarization to reach the ventricles, allowing for coordinated contraction and efficient pumping of blood.
