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Título: Heart's Electrical System
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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).
Crédito: Album / Science Source / Monica Schroeder
Tamaño imagen: 3732 × 4604 px | 49.2 MB
Tamaño impresión: 31.6 × 39.0 cm | 1469.3 × 1812.6 in (300 dpi)