Science

What is the heart? The heart is a fist-sized organ that pumps blood throughout your body.

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Subject Overview

What is the heart? The heart is a fist-sized organ that pumps blood throughout your body. It's the primary organ of your circulatory system. Your heart contains four main sections (chambers) made of muscle and powered by electrical impulses. Your brain and nervous system direct your heart's function

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  • Introduction
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