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🧠 What Do Organs Do and Where Are They? #kids #learn

ê cây này nghe hay ta ! #giaitri #amnhac #xuhuong #bolero #nhachay

220220_EW_FLAPSPIANO_prob4 | river flows in you

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