PVS 2100 Lecture 6: digestive system
14 Feb 2017
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Document Summary
Functions: prehension of food (ingestion, digestion, absorption, expulsion of the unabsorbed portion, elimination of some other waste products, defense teeth. Digestive system: digestive tract essentially a tube which runs from the mouth to the anus, glands that drain by ducts into the digestive tract e. g. salivary glands, pancreas liver. Rumen and reticulum (mature animal: note: rumen lls the left side of the abdominal cavity, both small and large intestine visible from right side, practical signi cance. Mastication (aka chewing: vertical action in carnivores, horizontal movements dominant in ruminants, physical digestion. Salivary glands: most saliva comes from glands outside the mouth, parotid gland (mostly serous secretion, mandibular gland (mixed secretion, sublingual gland (mixed secretion, small glands in the lips, cheeks, and tongue (mucous secretion) B12: chief cells produce pepsinogen, rennin, and gastric lipase (small amount, pyloric glands, predominantly mucus secreting cells, some chief cells.
