You Were Born With 270 Bones! Where Did The Other 64 Go? #ScienceFacts #HumanBody #SPClasses

How a Baby Grows from 1 Month to 2 Months in the Womb | The Incredible Transformation of a Baby

Animated 3d model of the Human Heart (3D ANIMATION)

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