PHYS20008 Lecture Notes - Lecture 15: Membrane Potential, Myenteric Plexus, Autonomic Nervous System
27 Jul 2018
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Document Summary
* digestion is how we absorb nutrients and water into our body. * major function of the human digestive system absorption of nutrients, digestion of complex food polymers, excretion of waste products, immune barrier to invasion from outside. What is the role of the gastrointestinal system: * digestion (physical digestion (mashing up) and chemical digestion (breaking of bonds enzymes)) * absorption get (cid:374)utrie(cid:374)ts out of the food (cid:449)e"(cid:448)e just digested absorbing into blood stream. * motility moving things (smooth muscle) through the digestive tract. * secretion (throughout entire digestive tract enzymes and buffers are being secreted to aid digestion and protect ourselves physically (from digesting ourselves) * protect body from pathogens from the external environment. * both physical and mechanical digestion begins in the mouth. * the colon has the major role in excretion. * bulk of nutrient absorption occurs in the duodenum/jejunum of small intestine. * same general structure from oesophagus to anus with 4 layers:
