Describe one cardiac cycle, beginning with both atria and ventricles relaxed.
Why is afterload important to cardiac function?
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Atrial depolarization initiates contraction of the atrial musculature. As the atria contract, the pressure within the atrial chambers increases, which forces more blood flow across the open atrioventricular (AV) valves, leading to a rapid flow of blood into the ventricles.
Explanation:
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