The circulatory system begins with the heart, a fist-sized muscular organ that acts as the central pump.The heart is a fist-sized muscular organ with four chambers. Let's examine how blood flows through it.Blood's journey starts when deoxygenated blood enters the right atrium through the superior and inferior vena cava.This blood passes through the tricuspid valve into the right ventricle.The right ventricle then contracts to pump blood through the pulmonary valve into the pulmonary arteries.The heart beats approximately one hundred thousand times daily, pumping about two thousand gallons of blood through its four chambers.This remarkable organ creates the pressure necessary to propel blood throughout the entire body, maintaining a continuous flow that sustains life.
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