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Title: Heart's Electrical System
Caption: Illustration depicting the heart's electrical system. Annotated are the Sinoatrial node and the atrioventricular node. The sinoatrial (SA) node (thick green oval upper left) consists of self-excitatory muscle cells that contract rhythmically at around 70 beats per minute. Following each contraction, an impulse spreads through the heart's upper chambers (atria, upper frame) to the atrioventricular (AV) node (thick green oval opposite SA node). Contraction of the atria causes blood to move into the lower chambers (ventricles, lower frame).
Category: medical • ILLUSTRATION
Credit: Album / Science Source / Monica Schroeder
Image size: 3732 × 4604 px | 49.2 MB
Print size: 31.6 × 39.0 cm | 1469.3 × 1812.6 in (300 dpi)