Describe the role of the hypothalamus in the regulation of hunger.
What will be an ideal response?
Students' answers may vary.
The answer should contain the following information:
Although the brain's hypothalamus has an important role in regulating food intake, the exact way this organ operates is still unclear. One hypothesis suggests that injury to the hypothalamus affects the weight set point, or the particular level of weight that the body strives to maintain, which in turn regulates food intake. Acting as a kind of internal weight thermostat, the hypothalamus calls for either greater or less food intake. In most cases, the hypothalamus does a good job. Even people who are not deliberately monitoring their weight show only minor weight fluctuations in spite of substantial day-to-day variations in how much they eat and exercise. However, injury to the hypothalamus can alter the weight set point, and a person then struggles to meet the internal goal by increasing or decreasing food consumption. Even temporary exposure to certain drugs can alter the weight set point.
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