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Everyone is aware of what makes a coronary heart beat -- cute cashiers at the grocery store. But what is liable for its distinctive sound? You realize the one: lub-dub, lub-dub, lub-dub. Most of us think it is the sound of our coronary heart beating or contracting, however it isn't. What we're listening to is the sound of two pairs of valves closing inside the chambers of our heart. Like turnstiles, these valves allow blood to move in one direction via the guts and keep it from backing up down a one-manner street. Can't quite picture it? Imagine you are going to a concert and two strains snake around the area: one for lucky people who snagged ground-seat tickets and one other line for ticket-holders headed to the nosebleeds. Each line has two sets of turnstiles. The first turnstiles that every line passes by way of rotate at the identical time, controlling the flow of concertgoers into the venue. When these turnstiles rotate, they make a noise -- lub.
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