What is the difference between AV and SA node?

What is the difference between AV and SA node?

The AV node sends an impulse into the ventricles. The lower heart chambers (ventricles) contract or pump. The SA node sends another signal to the atria to contract, which starts the cycle over again.

What is the function of the SA node?

An electrical stimulus is generated by the sinus node (also called the sinoatrial node, or SA node). This is a small mass of specialized tissue located in the right upper chamber (atria) of the heart. The sinus node generates an electrical stimulus regularly, 60 to 100 times per minute under normal conditions.

What are the 2 functions of the AV node?

As well as transmitting the impulse from the atria to the ventricles the atrioventricular node has two other important functions namely: synchronisation of atrial and ventricular contractions by a varying delay; and protection of the ventricles from rapid atrial arrhythmias.

How does the SA node work in the heart?

SA node (sinoatrial node) – known as the heart’s natural pacemaker. The impulse starts in a small bundle of specialized cells located in the right atrium, called the SA node. The electrical activity spreads through the walls of the atria and causes them to contract. This forces blood into the ventricles.

What happens if the sinoatrial node fails?

If the sinoatrial node fails, in a normal heart, the atrioventricular node (AV node) should take over the pacemaker function. But the spontaneous rate of the atrioventricular node is lower than that of the sinoatrial node. Hence the heart rate will be lower.

What is AV node?

The atrioventricular node, or AV node is a part of the electrical conduction system of the heart that coordinates the top of the heart.

What is AV conduction disease?

Author information: Atrioventricular (AV) conduction disease (block) describes impairment of the electrical continuity between the atria and ventricles.