Saint Louis Science Center (@stlsciencecenter)’s video of heart

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

This Healthy Drink Can Turn Dangerous With These Medications

20th Century: Two Worlds in One Century

Short drama review: quick take on a TikTok short

Speed Clean House Reset: Quick 30–60 Minute Cleaning Routine