Right now, your heart is beating. It has been beating since before you were born and will beat over 2 billion times in your lifetime — never stopping, never resting. ❤️ This fist-sized muscle is one of the most remarkable organs in nature. Four chambers, four valves, an internal electrical system, and a self-correcting rhythm — all working in perfect coordination. But do you really know how it's built and how it works? Let Avinto take you deep inside in Subtopic 5.1: The Mammalian Heart. 🔬 Type START to feel the science!
16/05/2026, 14:26:37
