Conducdtion system of the heart pdf basics

This step is where the upper chambers of the heart begin to squeeze. The SA node is located in a wall of the right atrium of your heart. The sinoatrial (SA) node is a cluster of cells that act as a natural pacemaker for your heart. The cascade travels through the electrical conduction system in the following order: Sinoatrial node

While all of the cardiac muscle in your heart can conduct electricity, there are certain areas of your heart - the electrical conduction system - where the cascade travels at different speeds. The lower chambers are the left and right ventricles.Д«lood travels through your heart in the following steps (the steps on the left and right are happening at the same time):ДЄs electricity moves through your heart, it causes each part it passes through to contract. The upper chambers are the left atrium and right atrium (theyвЂ™re called atria when you refer to them both). Knowing the heart's structure helps in understanding your heart's electrical system. What are the parts of the heartвЂ™s electrical conduction system? Streaked across their width.Д¬ells form larger fibers with many nuclei. Forms a mesh-like pattern with cells around it.Дistinct cells, each with one nucleus. More round when relaxed, oval-shaped when flexed. Unconscious (without you thinking about it).Д¬onscious (these move when you think about it).

Your body has three types of muscle: smooth, skeletal and cardiac. When you're active, your heart speeds up and beats faster. Under normal circumstances, this happens between 50 to 100 times per minute when you're at rest. This makes the chambers of your heart squeeze in a specific order, creating a heartbeat. That system activates, sending an electrical pulse through your heart muscle. To do that, your brain sends signals through your autonomic nervous system to your heartвЂ™s electrical system. Rather than your brain firing the electrical impulses, it relies on your heartвЂ™s conduction system. The timing of your heart muscleвЂ™s action is also critical. This includes your heart, breathing, digestion and more. This is the unconscious part of your nervous system, and it runs the functions of your body that you donвЂ™t think about. To do this, it relies on a specific part of your nervous system called the autonomic nervous system. However, your heart needs to do this 24/7, whether youвЂ™re asleep or awake. Your body uses electrical impulses to control when your muscles flex and relax, and your heart is no different. What does the cardiac conduction system do?

Conducdtion system of the heart pdf basics