An electrical stimulus is generated in a special part of the heart muscle called the sinus node. It’s also called the sinoatrial node (SA node). The sinus node is a small mass of special tissue in the right upper chamber of the heart (right atrium).

What is the heart's electrical system?

In the simplest terms, the heart is a pump made up of muscle tissue. Like all muscle, the heart needs a source of energy and oxygen to function. The heart’s pumping action is regulated by an electrical conduction system that coordinates the contraction of the various chambers of the heart.

What causes electrical problems with your heart?

Many patients have PSVT due to congenital abnormalities in the electrical conduction system of the heart. External causes can include hyperthyroidism, electrolyte imbalances, and the use of caffeine, alcohol, over-the-counter cold medications containing stimulants, or illegal drugs like cocaine and methamphetamine.

How do you fix the electrical system of the heart?

Typically, surgeons defibrillate the heart—send it a controlled electrical shock—to reset the electrical system, and then implant a pacemaker or defibrillator to maintain it.

What is superior node?

The SA node is the heart’s natural pacemaker. The SA node consists of a cluster of cells that are situated in the upper part of the wall of the right atrium (the right upper chamber of the heart). The electrical impulses are generated there. The SA node is also called the sinus node.

How is electrical heart failure diagnosed?

Your doctor may prescribe tests that will help diagnose your A-fib. These tests may include EKG, echocardiogram or electrophysiology studies (EPS). A-fib often is controlled with medications.

What is another name for sinoatrial node?

The sinoatrial node (also known as the sinuatrial node, SA node or sinus node) is a group of cells known as pacemaker cells, located in the wall of the right atrium of the heart.

What is a AV node?

The atrioventricular (AV) node is a small structure in the heart, located in the Koch triangle,[1] near the coronary sinus on the interatrial septum. In a right-dominant heart, the atrioventricular node is supplied by the right coronary artery.

What are SA and AV nodes?

The SA node (called the pacemaker of the heart) sends out an electrical impulse. The upper heart chambers (atria) contract. The AV node sends an impulse into the ventricles. … The SA node sends another signal to the atria to contract, which starts the cycle over again.

What is AV node in heart?

The atrioventricular (AV) node is a key part of the heart’s electrical system, controlling the transmission of the heart’s electrical impulse from the atria to the ventricles.

Article first time published on

Why is it called sinoatrial node?

These cells have the ability to spontaneous generate an electrical impulse. … The sinus node continuously generates electrical impulses, thereby setting the normal rhythm and rate in a healthy heart. Hence, the SA node is referred to as the natural pacemaker of the heart.

What is the difference between SA node and AV node?

SA node (Sinoatrial node)AV node (Atrioventricular node)Function Regulated by cardiac centre.Function stipulated by cardiac impulses.Firing rate is 60-100 bpm.Firing rate is 40-60 bpm.

What is nodal tissue?

Nodal tissues are a small mass of specialized cardiac muscle fibers, located in the wall of the right atrium of the heart, that receives electrical impulses from the sinoatrial node and directs them to the conduction system in the walls of the ventricles.

What is SAN and AVN?

The sinoatrial node (SAN) and the atrioventricular node (AVN) are specialized tissues in the heart: the SAN is specialized for pacemaking (it is the pacemaker of the heart), whereas the AVN is specialized for slow conduction of the action potential (to introduce a delay between atrial and ventricular activation during …

What is the function of Sino atrial node?

The sinoatrial node (SAN), located in the right atrium, serves as the primary site for initiation of the normal heartbeat (sinus rhythm) (Figure 1).

What is the bundle of his?

The bundle of His is an elongated segment connecting the AV Node and the left and right bundle branches of the septal crest. It is approximately 1.8 cm long in an adult heart[4] and is primarily located deep within the dense connective tissue.

What is Koch's triangle?

Koch’s triangle, named after the German pathologist and cardiologist Walter Karl Koch, is an anatomical area located in the superficial paraseptal endocardium of the right atrium, which its boundaries are the coronary sinus orifice, tendon of Todaro, and septal leaflet of the right atrioventricular valve.

What is the pacemaker of the heart called?

The sinus node is sometimes called the heart’s “natural pacemaker.” Each time the sinus node generates a new electrical impulse; that impulse spreads out through the heart’s upper chambers, called the right atrium and the left atrium (figure 2).

What is the AV junction?

Atrioventricular (AV) junction is the area separating atria and the ventricles of the heart. [1] Specifically, when talking about the AV junction, the focus is put more on its contents, the AV node and the nonbranching bundle of His.

What is decremental conduction?

Decremental Conduction: Decremental conduction denotes less and. less effective propagation of an impulse due to. a progressive decrease in membrane potential and velocity of rise of the action potential.

What are Purkinje fibers?

Purkinje fibers or Purkinje cardiomyocytes are part of the whole complex of the cardiac conduction system, which is today classified as specific heart muscle tissue responsible for the generation of the heart impulses.

What are 3 functions of the AV node?

It electrically connects the right atrium and right ventricle. This system generates electrical impulses and conducts them through out the heart, stimulating the heart to contract and pump blood. It serves as an electrical relay station that slows the current before the signal passes to the lower chambers.

What is the name of the relaxation phase of the cardiac cycle?

Systole is the contraction phase of the cardiac cycle, and diastole is the relaxation phase.

What is pacesetter in heart?

The atrioventricular node regulates the rhythm of the heart rate mainly. The delay in conduction of impulse in this node changes the duration of contraction between the atria and the ventricles. Hence, AV node is called as the pace-setter.

What is the function of Pectinate muscles?

The pectinate muscle folds act as RA volume reserve during adverse loading conditions . It helps RA dilate with out much wall stress.

What is the difference between the bundle of His and Purkinje fibers?

Bundle of His is a collection of specialized heart muscle cells that transmit electrical impulses from the AV node in the heart to the muscle cells of the heart wall. Meanwhile, Purkinje fibres are thin filaments that distribute electrical impulses to the ventricle myocardium and activate right and left ventricles.

Why SA node is known as the pacemaker of heart Class 10?

The SA node or sino-atrial node (SAN) is called the the natural pacemaker of the heart. It controls the heart rate by generating electrical impulses and then sending electrical signals through the heart muscle, causing the heart to contract and pump blood throughout the body. … It is found in blood vessels.

What is a myogenic heart?

The myogenic heart is the characteristics of vertebrates where continuous rhythmic contraction occurs. … The myogenic heart is the intrinsic property of the cardiac muscles. Each contraction of the heart muscle regulates the flow of blood in the form of a pulse or heart rate.

What is the systole phase?

systole, period of contraction of the ventricles of the heart that occurs between the first and second heart sounds of the cardiac cycle (the sequence of events in a single heart beat). Systole causes the ejection of blood into the aorta and pulmonary trunk.

What are the muscles of heart?

Cardiac muscle (also called heart muscle or myocardium) is one of three types of vertebrate muscle tissue, with the other two being skeletal muscle and smooth muscle. It is involuntary, striated muscle that constitutes the main tissue of the wall of the heart.

What is conduction system?

Heart Conduction System (Cardiac Conduction) The heart conduction system is the network of nodes, cells and signals that controls your heartbeat. … These signals cause different parts of your heart to expand and contract. The expansion and contraction control blood flow through your heart and body.