BIOL 1080 Chapter Notes - Chapter 4: Lacteal, Constipation, Lipoprotein
5 Apr 2015
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Document Summary
Consists of a long hollow tube called the gastrointestinal tract (gi), into which various accessory glands release their secretions. Walls of gi have four basic layers: mucosa innermost layer. Helps lubricate the lumen, allowing the food to move easily. Outer layer, arranged longitudinally, shorten gi when they contract. Segmental contractions allow the churning of food until it is liquified and mix digestive contents, also assist in absorption of digested food: serosa thin layer of epithelial tissue supported by connective tissue, wraps around the gi tract. Secretes fluid that lubricates the outside of the gi tract to reduce friction with contacting surfaces. Receives food, contains teeth and tongue, tongue manipulates food and monitors quality. Area that both food and air pass through. Tube that transports food from mouth to stomach. Teeth tear and crush food into smaller pieces. Churning of stomach mixes with food with gastric juices, creating liquid chyme. Long tube where digestion is completed and nutrients are absorbed.
