ESS 3 Lecture Notes - Lecture 3: Chyme, Large Intestine, Gastrointestinal Tract
7 Mar 2018
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Document Summary
Physiologic drive for food that occurs when our body senses that we need to eat. A variety of foods could satisfy you. Aroused when environmental cues stimulate your senses triggering pleasant emotions. People experience appetite in the absence of hunger. This prompt to eat is given by the hypothalamus in the brain. The hypothalamus triggers feelings of hunger or satiation (fullness) by signals from 3 sources: nerve cells, hormones, the amount and type of food we eat. Nerve cells: line the stomach and small intestine and detect changes in pressure according to whether the organ is empty or full. Relay information to the hypothalamus which prompts you to feel hunger: hormones: chemicals produced in specialized glands that travel in the bloodstream to target organs in other parts of the body. Some hormones produce a feeling of satiety (fullness: role of hormones. Insulin and glucagon are two hormones responsible for maintaining blood glucose levels.
