NUTR 100 Lecture Notes - Lecture 4: Caffeine, Glycerol, Burping
Document Summary
The nervous system stimulates your appetite: brain signals hunger and thirst to encourage you to seek food or fluids, tells us what to eat, when to eat, and when to stop eating. The cell uses the basic structures of nutrients for energy and a healthy body. Digestion: the breakdown of food into absorbable units using mechanical and chemical means within the gi track. To use food for energy it must be broken down into small pieces. Absorption brings nutrients into the tissues for use by the body"s cells: nutrients are absorbed into the small intestine and into two transport systems. Mechanical digestion involves the physical breakdown of food through chewing, grinding, and peristalsis: peristalsis is the rhythmic, muscular contractions that move food through the gi tract and mix it with enzymes. We begin breaking down food in the mouth. The esophagus propels food into the stomach.