What is the normal conduction pathway?
The conduction system of the heart. Left: Normal excitation originates in the sinoatrial (SA) node then propagates through both atria. The atrial depolarization spreads to the atrioventricular (AV) node, and passes through the bundle of His to the bundle branches/Purkinje fibers.
What is the pathway of conduction?
After passing through the AV node, the electrical current then continues down the conduction pathway, through a pathway called the bundle of His, and into the ventricles. The bundle of His divides into right and left pathways (bundle branches) to give electrical stimulation to the right and left ventricles.
What is the order of the conduction pathway?
The cardiac conduction system comprises the following structures, in order, the SA node, the AV node, the bundle of His, the bundle branches, and the Purkinje fibers.
What are the 4 stations of the conductive pathway?
Cardiac Conduction System
- The sino-atrial (SA) node.
- The atrio-ventricular (AV) node.
- The bundle of His.
- The left and right bundle branches.
- The Purkinje fibres.
What is the difference between conduction and contraction?
Contractile cells conduct impulses and are responsible for contractions that pump blood through the body. Myocardial conduction cells initiate and propagate the action potential (the electrical impulse) that travels throughout the heart and triggers the contractions that propel the blood.
How does the conduction system work?
A network of specialized muscle cells is found in the heart’s walls. These muscle cells send signals to the rest of the heart muscle causing a contraction. This group of muscle cells is called the cardiac conduction system.
What is conduction pathway of the heart?
A network of specialized muscle cells is found in the heart’s walls. These muscle cells send signals to the rest of the heart muscle causing a contraction. This group of muscle cells is called the cardiac conduction system. The SA node starts the sequence by causing the atrial muscles to contract.
What are the steps of heart conduction?
4 Steps of Cardiac Conduction
- Step 1: Pacemaker Impulse Generation. The first step of cardiac conduction is impulse generation.
- Step 2: AV Node Impulse Conduction.
- Step 3: AV Bundle Impulse Conduction.
- Step 4: Purkinje Fibers Impulse Conduction.
What is the pathway of the conduction system of the heart?
The electrical impulse travels from the sinus node to the atrioventricular node (also called AV node). There, impulses are slowed down for a very short period, then continue down the conduction pathway via the bundle of His into the ventricles.
What is the conductive pathway of the heart?
This group of muscle cells is called the cardiac conduction system. The main parts of the system are the SA node, AV node, bundle of HIS, bundle branches, and Purkinje fibers. Let’s follow a signal through the contraction process. The SA node starts the sequence by causing the atrial muscles to contract.
What is the conduction pathway of the heart?
Which is the shortest route in the conduction system?
It is believed by many that there are three preferential anatomic conduction pathways from the sinoatrial node to the atrioventricular node [1,18]. In general, these can be considered as the shortest electrical routes between the nodes.
Conduction Pathway of the Heart. The SA Node has autorhymic fibers that are capable of initiating cardiac action potentials and setting the basic pace for the heart. 2. The Atrioventricular Node receives the action potentials from the SA Node and triggers the conduction of the Atrioventricular Node Bundle of HIS. 3.
Where does the bundle branch of the conduction system run?
This bundle branch runs proximally, just beneath the endocardium, and its course runs slightly inferior to the septal papillary muscle of the tricuspid valve before dividing into fibers that spread throughout the right ventricle.
Where is the conduction system located in the human body?
Conduction system anatomy; specialized conduction tissues labeled in bold type. A. Sinus node and atrium The heartbeat is normally begun in cells of the sinoatrial (SA), or sinus, node which is located in the high lateral right atrium where it adjoins the superior vena cava (embryonic sinus venosus region) (Fig. II-2).