![]() 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 signal spreads through the chambers of the heart. The sinus node creates an electrical signal 60 to 100 times per minute. This is a small area of special cells in the right upper chamber (atrium) of the heart. This is also called the sinoatrial node (SA node). Then the ventricles contract.Īn electrical signal starts in the sinus node of the heart. ![]() The blood in the atria empties into the ventricles. The atria contract a fraction of a second before the ventricles. The rate depends on a person's age.Įach contraction of the ventricles is 1 heartbeat. Normally, as the electrical impulse moves through the heart, the heart contracts about 60 to 100 times a minute. This system that organizes how the chambers of the heart contract and pump blood. The heart's pumping action is controlled by an electrical system. ![]() Like all muscle, the heart needs a source of energy and oxygen to work. The heart is a pump made up of muscle tissue. Anatomy and Function of the Heart's Electrical System ![]()
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