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BIOL 1080 (54)
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3B(ii).docx

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Department
Biology
Course
BIOL 1080
Professor
Jim Kirkland
Semester
Winter

Description
Chapter 3b(ii) The Digestive System - Consists of a long hollow tube  Gastrointestinal (GI) tract o Begins at the mouth and continues to the esophagus, stomach, small intestine, and large intestine. o 4 basic layers  Mucosa  Innermost layer, filled with mucus which helps lubricate the lumen  Submucosa  Connective tissue containing blood vessels, lymphs vessels and nerves  Muscularis  Responsible for movement of material  double layer of smooth muscle  Serosa  Thin layer of epithelial tissue supported by connective tissue.  Lubricates the outside of the GI tract Mechanical digestion: The physical breaking of food into smaller pieces Chemical digestion: The breaking of chemical bonds so that complex molecules are taken apart into smaller subunits. Mouth - It begins mechanical and chemical digestion - Monitors food quality - Moistens and manipulates food so that it can be swallowed Teeth are alive - at the center of teeth  pulp  contains life-support system  blood vessels that nourish the teeth and nerves that sense heat, cold, pressure, pain Gingivitis  gum disease  plaque has formed along the gum lines, causing them to become inflamed and swollen Salivary Glands - 3 pairs o Sublingual (below the tongue) o Submandibular (below the jaw) o Parotid (in front of the ears) - Saliva contains salivary amylase  chemically digests starches into shorter chains of sugar Esophagus
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