Chapter 24 Digestive 2 - 24-1Chapter 24Digestive...

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Unformatted text preview: 24-1Chapter 24Digestive System24-2Digestive System Anatomy•Digestive tract–Alimentary tract or canal–GI tract•Accessory organs–Primarily glands•Regions–Mouth or oral cavity–Pharynx–Esophagus–Stomach–Small intestine–Large intestine–Anus24-3Functions•Ingestion: Introduction of food into stomach•Mastication: Chewing•Propulsion–Deglutition: Swallowing–Peristalsis: Moves material through digestive tract24-4Functions•Mixing: Segmental contraction that occurs in small intestine•Secretion: Lubricate, liquefy, digest•Digestion: Mechanical and chemical•Absorption: Movement from tract into circulation or lymph•Elimination: Waste products removed from body24-5Digestive Tract Histology24-6Digestive System Regulation•Nervous regulation–Involves enteric nervous system•Types of neurons: sensory, motor, interneurons–Coordinates peristalsis and regulates local reflexes•Chemical regulation–Production of hormones•Gastrin, secretin–Production of paracrine chemicals•Histamine •Help local reflexes in ENS control digestive environments as pH levels 24-7Peritoneum and Mesenteries•Peritoneum–Visceral: Covers organs–Parietal: Covers interior surface of body wall–Retroperitoneal: Behind peritoneum as kidneys, pancreas, duodenum•Mesenteries–Routes which vessels and nerves pass from body wall to organs–Greater omentum–Lesser omentum24-8Oral Cavity•Mouth or oral cavity–Vestibule: Space between lips or cheeks and alveolar processes–Oral cavity proper•Lips (labia) and cheeks•Palate: Oral cavity roof–Hard and soft •Palatine tonsils•Tongue: Involved in speech, taste, mastication, swallowing24-9Teeth•Two sets–Primary, deciduous, milk: Childhood–Permanent or secondary: Adult (32)•Types–Incisors, canine, premolar and molars24-10Teeth24-11Salivary Glands•Produce saliva–Prevents bacterial infection–Lubrication–Contains salivary amylase•Breaks down starch•Three pairs–Parotid: Largest–Submandibular–Sublingual: Smallest24-12Pharynx and Esophagus...
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Chapter 24 Digestive 2 - 24-1Chapter 24Digestive...

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