HUBS1404 Lecture Notes - Lecture 8: Feces, Serous Membrane, Submucosa
26 Oct 2018
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Document Summary
Extract & absorb nutrients from food as it is propelled through the gut. Able to communicate and coordinate with each other so that the process occurs sequentially. This is produced by the action of two layers of smooth muscle. Peristalsis: adjacent segments of alimentary tract organs alternatively contract and relax, which moves food along the tract distally a wave of contraction and relaxation of the walls to push food down the gut. Segmentation: nonadjacent segments of alimentary tract organs alternately contract and relax, moving the food forward then backward. Food mixing and slow food propulsion occurs the mechanism of mixing the food together (digestion) A number of sphincter muscles (also smooth muscle) can prevent movement from one section of the tract to another when contracted. Want to stop the passage as different areas are doing different things at different times. It controls the movement of food particles as it gets digested.
