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Here's exactly what happens every time your heart beats 🫀 It starts with an electrical signal from the SA node — your heart's natural pacemaker. That signal tells your atria to contract, pushing blood down into the ventricles. Then the ventricles contract (ventricular systole): 🫀 Right ventricle → pumps deoxygenated blood to the lungs 🫀 Left ventricle → pumps oxygen-rich blood to the rest of your body After that, the heart enters diastole — a brief relaxation where the chambers refill and pre
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The arteries that deliver oxygenated blood to the heart are called coronary arteries. Delivering oxygen to heart muscle cells is super important for these (myocardial) cells to function. If a group of myocardial cells does not receive oxygen, then they won’t be able to produce energy. If these myocardial cells stop producing energy, then not only they will stop contracting (which takes a lot of energy) but in a matter of minutes they will die (being alive also requires energy!). . Coronary ather
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