![]() ![]() There, impulses are slowed down for a very short period, then continue down the conduction pathway via the bundle of His into the ventricles. The electrical impulse travels from the sinus node to the atrioventricular node (also called AV node). The 2 upper chambers of the heart (atria) are stimulated first and contract for a short period of time before the 2 lower chambers of the heart (ventricles). The electrical stimulus travels down through the conduction pathways and causes the heart's ventricles to contract and pump out blood. The sinus node generates an electrical stimulus regularly, 60 to 100 times per minute under normal conditions. This is a small mass of specialized tissue located in the right upper chamber (atria) of the heart. The heart's pumping action is regulated by an electrical conduction system that coordinates the contraction of the various chambers of the heart.Īn electrical stimulus is generated by the sinus node (also called the sinoatrial node, or SA node). Like all muscle, the heart needs a source of energy and oxygen to function. ![]() In the simplest terms, the heart is a pump made up of muscle tissue. ![]()
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