What are the 5 steps of the cardiac electrical conductivity?

What are the 5 steps to the conduction system of the heart?

Intrinsic Conduction System of the Heart

  • Step 1: Stimulation of the sinoatrial node. SA node. …
  • Step 2: Stimulation of the atrioventricular node. AV node. …
  • Step 3: Propagation to the AV bundle. AV bundle. …
  • Step 4: Splitting into the bundle branches. bundle branches. …
  • Step 5: Propagation up the Purkinje fibers (subendocardial conducting network) Purkinje fibers.

What are the 5 parts of the conduction system in order?

The main parts of the system are the SA node, AV node, bundle of HIS, bundle branches, and Purkinje fibers.

What is the order of electrical conduction through 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.

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What is the cardiac conduction system and its function?

The cardiac conduction system is a network of specialized cardiac muscle cells that initiate and transmit the electrical impulses responsible for the coordinated contractions of each cardiac cycle. … Upon stimulation by the action potential, myocardial cells contract synchronously, resulting in a heartbeat.

What is the correct order of depolarization in the heart?

The atrial depolarization spreads to the atrioventricular (AV) node, passes through the bundle of His (not labeled), and then to the Purkinje fibers which make up the left and right bundle branches; subsequently all ventricular muscle becomes activated.

How does the heart contract step by step?

The heartbeat happens as follows:

  1. The SA node (called the pacemaker of the heart) sends out an electrical impulse.
  2. The upper heart chambers (atria) contract.
  3. The AV node sends an impulse into the ventricles.
  4. The lower heart chambers (ventricles) contract or pump.

Where are Purkinje fibers located?

The purkinje fibres are found in the sub-endocardium. They are larger than cardiac muscle cells, but have fewer myofibrils, lots of glycogen and mitochondria, and no T-tubules.

How do Purkinje fibers work?

During the ventricular contraction portion of the cardiac cycle, the Purkinje fibers carry the contraction impulse from both the left and right bundle branch to the myocardium of the ventricles. This causes the muscle tissue of the ventricles to contract.

What is the function of Purkinje fibers?

Purkinje fibers play a major role in electrical conduction and propagation of impulse to the ventricular muscle. Many ventricular arrhythmias are initiated in the Purkinje fiber conduction system (eg.

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Does Heart produce electricity?

The heart generates its own electrical signal (also called an electrical impulse), which can be recorded by placing electrodes on the chest. This is called an electrocardiogram (ECG, or EKG). The cardiac electrical signal controls the heartbeat in two ways.

Which are electrical nodes of the heart?

The heart has two nodes that are instrumental in cardiac conduction, which is the electrical system that powers the cardiac cycle. These two nodes are the sinoatrial (SA) node and the atrioventricular (AV) node.

How can I strengthen my heart for electricity?

These tips can help keep both the blood and electricity flowing through the heart at an appropriate and healthy rate:

  1. Quit tobacco: smoking damages the arteries, leading to angina, heart attack or stroke.
  2. Exercise regularly: 30 minutes of moderate daily activity improves blood flow and heart strength.


What is the role of sinoatrial 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). … AVN conduction is slow, thereby introducing a delay between atrial and ventricular systole to facilitate filling of the ventricles before they contract.

What is the cardiac conduction cycle?

Cardiac conduction is the driving force behind the cardiac cycle. This cycle is the sequence of events that occur when the heart beats. During the diastole phase of the cardiac cycle, the atria and ventricles are relaxed and blood flows into the atria and ventricles.

What is bundle of his in heart?

The atrioventricular bundle (bundle of His) is a continuation of the specialised tissue of the AV node, and serves to transmit the electrical impulse from the AV node to the Purkinje fibres of the ventricles.

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Cardiac cycle