100_Chap_15_Digestion_Sum_10

100_Chap_15_Digestion_Sum_10 - Digestive System Figure 14.1...

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Unformatted text preview: Digestive System Figure 14.1 Gastrointestinal (GI) Tract Wall 3 rd type of smooth muscle in stomach (oblique/diagonal) Gastrointestinal (GI) Tract Layers Structure: common layers throughout the system Mucosa: innermost layer, nutrients pass through bmucosa: connective tissue, lymph and blood Submucosa: connective tissue, lymph and blood vessels, nerves Muscularis: two or three layers of smooth muscle, responsible for motility in GI tract Serosa: outermost layer, connective tissue sheath Digestive System Processes Five Processes Mechanical processing and movement: chewing, mixing Secretion: fluid, digestive enzymes and hormones, bile, acid, alkali, mucus Digestion: breaking down food to smallest absorbable units Absorption: through mucosa, into blood or lymph vessels Elimination: undigested material eliminated Motility: Peristalsis Figure 14.3A http://www.lionden.com/peristalsis.htm Motility: Segmentation Figure 14.3B The Mouth: Teeth Figure 14.4 Bacteria on Tooth Surface Tooth Decay Healthy Teeth The Mouth Mouth: begins digestion Teeth Types: incisors, canines, premolars, molars Structure: crown, root Tongue: skeletal muscle, moves food in mouth, taste Saliva Moistens food and makes it easier to swallow Composition: mucin, salivary amylase, bicarbonate, lysozyme Swallowing Swallowing: Delivers Food to Stomach Voluntary phase: tongue pushes bolus of food into pharynx Involuntary phase/swallowing reflex: receptors in pharynx stimulated by presence of food Soft palate rises Larynx rises slightly Epiglottis closes opening to trachea Tongue pushes food further Food enters esophagus Pharynx and Esophagus...
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100_Chap_15_Digestion_Sum_10 - Digestive System Figure 14.1...

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