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Attention, chocolate lovers: You may not be able to help yourselves. Swiss and British scientists have linked the widespread love of chocolate to a chemical "signature" that may be programmed into our metabolic systems.
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Heart
Heart: The heart is a muscle which pumps blood it receives from veins into arteries throughout the body. The heart is composed of specialized muscle called "cardiac muscle." (see muscle). The heart, veins and arteries make up the circulatory system.