Exploring Your Heart’s Electrical Conduction Your heart has four chambers, four valves, two nodes, and a system of fibers known as the His-Purkinje system. The four chambers consist of two atria (upper chambers) and two ventricles (lower chambers). Your four valves consist of a tricuspid valve, pulmonary valve, mitral valve, and aortic valve. google_ad_client = [...]

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Diagnosing And Treating An Atrial Septal Defect Your heart’s left and right sides are separated by an inner wall of tissue called the septum. This wall helps to prevent oxygen-poor blood on the right side from mixing with oxygen-rich blood on the left side. If the portion of the wall that separates the atria has [...]

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