PSY290H1 : psy290 lecs 8-10 (chp9,12-15).pdf
Document Summary
Eating: believe, hunger & eating are normally triggered when body"s energy resources fall below prescribed optimal level (set point, assume, hunger & eating system evolved to supply body with right amount of energy. Digestion: purpose of hunger: inc probability of eating, purpose of eating, supply body with molecular building blocks & energy needed to survive & function, digestion, gastrointestinal process of breaking down food & absorbing its constituents into the body. Chewing breaks up food & mixes it with saliva. Swallowing moves food & drink down esophagus to stomach. Stomach functions as a storage reservoir, hydrochloric acid breaks food into small particles, pepsin breaks down protein into aa. Stomach empties contents through pyloric sphincter into duodenum. Digestive enzymes in duodenum break down proteins to aa, starch & complex sugars into simple sugars, simple sugars & aa pass through duodenum wall into bloodstream to liver.
