Anatomy and Cell Biology 3309 Lecture Notes - Lecture 7: Muscularis Mucosae, Esophagus, Submucosa
7 Mar 2017
School
Department
Professor
Document Summary
Lecture 7: mucosa physical barrier for pathogens, absorption, and secretion. Layers and functions of the gi tract: 4 main concentric layers, barrier, absorption/digestion, secretion: endo- and exocrine. Layers of the stomach: smooth surface (nothing protrudes into lumen, surface cells are all made up of simple columnar epithelium, long elongated tubular glands protrudes into the mucosa, mucosa is separated from submucosa by muscularis mucosae. Body produces lots of secretion that fills the content of: body short pits and long glands, pylorus long pits and short glands stomach. Important for lubrication (surface cells producing mucus) Have some lymphoid nodules in the mucosa: surface is made up of one cell type mucous secreting cells, glands are made up of different cell types than surface cells. Intrisic factor: a small peptide that"s important for the absorption of. Without this factor we can"t absorb it & we become deficient: hcl: produced to breakdown proteins; under the control of gastrin.
