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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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Left heart
Left heart: The heart is composed functionally of two heartsùthe right heart and the left heart. The left heart consists of the left atrium which receives oxygenated blood from the lung and the left venticle which pumps it out to the body under high pressure.