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Speaker 1: and moz Y dot com. Welcome to brain Stuff from

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Speaker 1: how Stuff Works dot com where smart Happens. Hi, I'm

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Speaker 1: Marshall Brain with today's question, what is a heart bypass operation?

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Speaker 1: Your heart is an amazing organ. It beats thousands of

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Speaker 1: times each day, every day for your entire life. In

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Speaker 1: the process, it pumps about five million gallons of blood

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Speaker 1: through your body. Since the heart is a muscle, it

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Speaker 1: needs blood for the oxygen and nutrients it contains, but

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Speaker 1: it can't use the blood it's pumping. Instead, there are

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Speaker 1: arteries on the outside of the heart that provide the

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Speaker 1: blood that the muscle needs. If one of the these

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Speaker 1: outer arteries gets clogged, it causes a heart attack. A

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Speaker 1: blockage like this is normally caused by fatty deposits that

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Speaker 1: build up in the hearts arteries over the course of

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Speaker 1: many years. Everything you hear about fat in the diet, cholesterol,

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Speaker 1: coronary artery disease, and clogged arteries is focused on this problem.

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Speaker 1: It turns out that blocked heart arteries and the heart

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Speaker 1: attacks they cause, are a leading killer in the United States.

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Speaker 1: When one of the hearts arteries gets blocked and a

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Speaker 1: person has a heart attack, one common treatment is heart

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Speaker 1: bypass surgery. They sew in a new piece of blood

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Speaker 1: vessel to bridge over or bypass the blockage in an artery.

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Speaker 1: In many cases, the surgeon will fix not only the

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Speaker 1: immediate problem, but also other arteries on the heart that

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Speaker 1: are starting to look blocked. If the surgeon repairs three

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Speaker 1: of the arteries, it's called a triple bypass operation. If

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Speaker 1: four arteries are repaired, that's a quadruple bypass. The blood

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Speaker 1: vessel used to create the bypass is taken from the

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Speaker 1: chest or the leg. The body has several redundant vessels

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Speaker 1: that are removed without doing any harm. For more on

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Speaker 1: this and thousands of other topics, visit how stuff works

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Speaker 1: dot com. Protect your photos, music and documents and access

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Speaker 1: today at m o z y dot com.