The signal starts in diastole and reaches the AV node at the start of systole. The AV node sits at the junction of the atria and ventricles.
The AV node conducts the signal to the bundle of His, which runs down the path in between the two ventricles.
The bundle of His signals the Purkinje fibers to contract the ventricles. The purkinje fibers distribute electrical signal throughout the ventricles.
The tricuspid valve between the right atrium and ventricle closes to prevent backflow into the atrium.
The pulmonary valve opens to allow blood to flow from the right ventricle to the lungs for oxygen saturation.
The mitral valve between the left atrium and ventricle is closed to prevent backflow into the atrium during ventricular contraction.
The aortic valve opens to allow oxygenated blood to flow from the left ventricle to the aorta and out to systemic circulation.
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