Illustration depicting the heart's electrical system (yellow circuitry) with a normal EKG in the background. The sinoatrial (SA) node (thick yellow 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 yellow oval opposite SA node). Contraction of the atria causes blood to move into the lower chambers (ventricles,lower frame) | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Schroeder, Monica |
Bildgröße: | 3732 px × 4604 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: |
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