HSS 2342 Lecture Notes - Lecture 2: Pylorus, Chyme, Facilitated Diffusion
8 Feb 2017
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Document Summary
Digestion is the process of turning foods into nutrients. Challenges include tasks of the mouth, diaphragm, steady movement (pace that permits the completion of all digestive processes), lubrication of food (ease passage and aid in digestive processes), digestive enzyme functions, and management of waste. Anatomy of the digestive tract: the gi tract. The gastrointestinal tract consists of the mouth, pharynx, stomach, liver, intestines, pancreas, etc. all organs that work together from ingestion to elimination. The stomach adds juices and grinds up the food (bolus) into a semi-liquid mass called chyme. Chyme is then slowly released into the small intestine in a controlled manner that involves the opening of the pyloric sphincter. The large intestine is where water is absorbed to make semi-solid waste: the muscular action of the digestive tract. The stomach has three layers of muscles: longitudinal, circular, and diagonal. These are the thickest walls and strongest muscles of the gi tract.
