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Here's exactly what happens every time your heart beats πŸ«€ It starts with an electrical signal from the SA node β€” your heart's natural pacemaker. That signal tells your atria to contract, pushing blood down into the ventricles. Then the ventricles contract (ventricular systole): πŸ«€ Right ventricle β†’ pumps deoxygenated blood to the lungs πŸ«€ Left ventricle β†’ pumps oxygen-rich blood to the rest of your body After that, the heart enters diastole β€” a brief relaxation where the chambers refill and pre
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