Which is the correct sequence of parts through which cardiac action potentials pass?

AV node, atrial fibres, SA node, bundle of His, Purkinje fibres.

What is the correct sequence of the cardiac conduction system?

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 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.

What is the part of the heart that initiates the contraction of the heart?

The heart’s electrical system

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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.

What does the AV bundle do?

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.

What are the 5 steps of the cardiac electrical conductivity?

Cardiac conduction can be influenced by various factors including exercise, temperature, and endocrine system hormones.

  • Step 1: Pacemaker Impulse Generation.
  • Step 2: AV Node Impulse Conduction.
  • Step 3: AV Bundle Impulse Conduction.
  • Step 4: Purkinje Fibers Impulse Conduction.
  • Cardiac Conduction and the Cardiac Cycle.


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

This pathway is made up of 5 elements:

  • 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 electrical pathway of the heart in order?

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 are the 3 main parts of the heart’s electrical system?

Your heart’s electrical system is made up of three main parts:

  • The sinoatrial (SA) node, located in the right atrium of your heart.
  • The atrioventricular (AV) node, located on the interatrial septum close to the tricuspid valve.
  • The His-Purkinje system, located along the walls of your heart’s ventricles.
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How the heart contracts step by step?

When the SA node sends an electrical impulse, it triggers the following process:

  1. The electrical signal travels from your SA node through muscle cells in your right and left atria.
  2. The signal triggers the muscle cells that make your atria contract.
  3. The atria contract, pumping blood into your left and right ventricles.

How can I strengthen my heart naturally?

Improving Heart Health Naturally 5 | Lower Your Resting Blood Pressure To Below 120/80

  1. Eat at least 5 servings of vegetables and 4 servings of fruits daily. …
  2. Cut back on calorie-dense foods loaded with fat, sugar, and/or refined grains. …
  3. Limit consumption of sodium to a healthy level. …
  4. Limit alcohol drinking. …
  5. Exercise daily.

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 causes damage to heart’s electrical system?

It can also be caused by problems with your heart function such as heart failure or leaky heart valves. Sometimes surgical intervention can also bring on this kind of problem. If these rhythm disturbances come from the upper chambers of the heart, they are called atrial arrhythmias (abnormal rhythms of the heartbeat).

What is the unique characteristic of AV bundle?

A unique and important feature of the AV bundle is that it only allows the ‘forward’ movement of action potentials. Therefore, the retrograde transmission of electrical impulses from the ventricles to the atria is not allowed in a normal functioning heart.

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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.

Why is it called a bundle of his?

These specialized muscle fibers in the heart were named after the Swiss cardiologist Wilhelm His Jr., who discovered them in 1893.

Cardiac cycle