PHYSL210B Lecture 7: Digestion
14 Feb 2019
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Document Summary
Breaking down of complex food material to smaller, simpler molecules the body is capable of absorbing. This lining is folded to increase the surface area. In the stomach these folds are very prominent called rugae. Stomach doesn"t take up a lot of space in the abdomen when not eating. Smooth muscle (muscularis mucosae) thin layer; expands and contracts the mucosa and mix the contents in the gut. Blood vessels absorb nutrients and take them away. Sub-mucosa layer of loose connective tissue formed of collagen, and contains a network of nerves. The brain and the spinal cord is not that all involved in the regulation of the git. Nervous control: extrinsic nerves autonomic (parasympathetic and sympathetic); parasympathetic: afferent sensory; efferent motor; generally excitatory (promote movement and secretion, intrinsic nerves enteric nervous system. Submucosal plexus control secretion and blood flow; secretion of mucus and enzymes; covers small and large intestine. Myenteric plexus longer, from oesophagus to internal anus sphincter; controls motility.
