Heart flow chart

Blood pressure Video transcript So what you're looking at is one of the most amazing organs in your body. This is the human heart. And it's shown with all the vessels on it. And you can see the vessels coming into it and out of it. But the heart, at its core, is a pump.
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File:Circulation of Blood Through the Heart.jpg

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Blood Throught the Heart

Branching Blood Vessels The heart is a pump whose walls are made of thick muscle. They can squeeze contract to send blood rushing out. The blood does not spill all over the place when it leaves the heart. Instead, it flows smoothly in tubes called blood vessels. First, the blood flows into tubes called arteries. The arteries leaving the heart are thick tubes. But the arteries soon branch again and again to form smaller and smaller tubes.
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Flow through the heart

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