by Nottingham Vet School
The organ has four chambers: two atria (upper chambers) and two ventricles (lower chambers). Within the right atrium, a group of cells known as the sinoatrial node generates electrical impulses. These impulses spread throughout your atria, causing them to contract. As the contractions cause blood to move from the atria into the ventricles,
the impulses travel to the atrioventricular node. This is another group of cells that sits between the ventricles and atria. Once
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