How your heart works: two pumps, one spark, and what a heart attack really is
Heart valves: what really makes the lub-dub sound of your heart
Put your ear on a friend's chest and you hear it: lub-dub, lub-dub. It is mostly not the sound of the muscle squeezing. So what makes it?
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1
A week later, his doctor listens to his heart: lub, dub, lub, dub. Everyone knows this sound. Few people know what makes it.
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2
Each beat makes two sounds, close together. Yet a squeezing muscle makes almost no sound. Something else is making the noise.
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