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Read the following text and answer the question!
Have you ever wondered how your brain receives a message that makes us feel hungry? Hunger has nothing to do with an empty stomach, as most people believe.
Hunger begins when certain nutritive materials are missing in the blood. When the blood vessels lack these materials, a message is sent to a part of the brain that is called the "hunger center". This hunger center works like a brake on the stomach and intestine. As long as the blood has sufficient food, the hunger center slows up the action of the stomach and intestine. When the food is missing from the blood, the hunger center makes the stomach and intestine more active. That is why a hungry person often hears his stomach rumbling
From the text we can conclude that ___.
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