Body & Brain
Your Amazing Heart
Two pumps in one. 4 chambers, 4 valves, 100,000 beats a day. Never naps.
Right now, in your chest, a tiny muscle is squeezing. THUMP-thump. THUMP-thump. About 100,000 times today. Has been since before you were born.
Concepts you just met
Cardiac CycleChambersCirculationHeart Rate