[PHYSL214] - Midterm Exam Guide - Comprehensive Notes for the exam (71 pages long!)
7 Feb 2017
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It is autonomic: mucosa, epithelium, lamina propria: connective tissue, blood vessels, muscularis mucosae: thin layer of smooth muscle, submucosa, connective tissue, nerves, blood vessels, muscularis externa (muscle layers) Innervation of smooth muscle in the gi tract: the enteric nervous system (intrinsic muscle, consists of the submucosal plexus and the myenteric plexus. Yy/enteroglucagon/glicentin: paracrine, diffuses through interstitial fluid, eg. Smooth muscle of gi tract: size of muscle contraction depends on where the slow waves are, timescale depends on where it is in the gi system. Physl 214 - lecture #4 - gi tract pt. Iv: control of gastric secretion: interactions between various factors, stimulate parasympathetic nerve: more acid comes out, the phases of gastric secretion, 1. Cephalic phase (20 - 30%: anticipatory, excitatory, mainly via vagus, 2. Gastric phase (60 - 70%: major phase, excitatory, mainly via gastrin, presence of food = produces more gastrin, 3.
