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Module 35 - Module 35 Hunger The Physiology of Hunger...

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Module 35: Hunger The Physiology of Hunger Physiological determinants of hunger… Glucose: the form of sugar that circulates in the blood and provides the major source of energy for body tissues. - if the glucose level drops, hunger increases Two hypothalamic centers help control eating… 1. Lateral hypothalamus (sides) – when electrically stimulated, well-fed animals eat, when destroyed, they have no intereset in food. -Orexin: Hunger-triggering hormone secreted by hypothalamus 2. Ventromedial hypothalamus (lower-mid) – depresses hunger. Stimulation makes an animal stop eating, destroying it makes the stomach and intestines process food more rapidly, causing it to become very fat. Ghrelin: hormone secreted by empty stomach; sends “I’m hungry” signals to brain. Leptin: protein secreted by fat cells; when abundant, causes brain to increase metabolism and decrease hunger. PYY: Digestive tract hormone; sends “I’m not hungry” signals to brain.
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