Sinusnoden
The sinus node, also known as the sinoatrial node or SA node, is a specialized area of cardiac tissue located in the upper wall of the right atrium of the heart. It functions as the natural pacemaker of the heart, initiating the electrical impulses that cause the heart to beat. These impulses originate spontaneously within the sinus node and spread outwards through the atria, causing them to contract.
The sinus node is composed of modified cardiac muscle cells that have the unique ability to generate
When the electrical impulse leaves the sinus node, it travels through the atrial walls, causing them to