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DIGESTIVE SYSTEM

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DIGESTIVE SYSTEM. Through stomach. Overall Digestive Process. Ingestion. Movement ... Nervous System Medulla oblongata & Pons. ANS. Smell, thought, sight, ... – PowerPoint PPT presentation

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Title: DIGESTIVE SYSTEM


1
DIGESTIVE SYSTEM
  • Through stomach

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Overall Digestive Process
  • Ingestion
  • Movement
  • Digestion (mechanical chemical)
  • Absorption (into blood/lymph vessels)
  • Elimination Defecation

4
GI Organization
  • Digestive tract canal
  • Gastrointestinal tract
  • Alimentary canal
  • Accessory Structures outside of the tract

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Microstructure - general
  • Mucosa
  • Mucous membrane
  • May have villi and microvilli
  • Submucosa
  • Very vascular
  • Muscularis
  • Serosa Visceral Peritoneum

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Peritoneum
  • Parietal peritoneum
  • Visceral peritoneum
  • Peritoneal cavity

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Folds of Peritoneum
  • Binds organs together, anchors them, suspends
    vessels
  • Mesentery proper (SI-Dorsal BW)
  • Mesocolon Mesorectum (LI-Dorsal BW
  • Falciform ligament (Li-Ventral BW)
  • Lesser omentum (Lesser curvature/duodenum-Li)
  • Greater omentum (Greater curvature-Dorsal BS

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Oral Cavity
  • Labia
  • Labial frenulum
  • Hard palate
  • Soft palate
  • Uvula

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Tongue (accessory)
  • Glosso-
  • Lingu-
  • Skeletal muscle covered by mucous membrane
  • Lingual frenulum

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Tongue
  • Papillae
  • Taste Zones
  • Sweet, Salt
  • Sour, Bitter
  • Function
  • Bolus formation

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Salivary Glands (accessory)
  • Parotid
  • Submandibular
  • Sublingual

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Saliva
  • 1-1 ½ liters/day
  • 99 water
  • Mucins
  • Amylase
  • Lysozyme anti-microbial

24
Saliva Secretion Controls
  • Nervous System Medulla oblongata Pons
  • ANS
  • Smell, thought, sight, irritation
  • Dehydration, Fear

25
Teeth (accessory)
  • Gingivae
  • Crown
  • Root
  • Neck

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Tooth Components
  • Periodontal ligament
  • Dentin
  • Pulp cavity pulp
  • Apical foramen
  • Enamel
  • Cementum

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Teeth
  • Deciduous 20
  • Permanent - 32

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Teeth - shape
  • Incisor
  • Canine
  • Premolar
  • Molar

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Dental Terminology
  • Labial
  • Buccal
  • Lingual
  • Palatal
  • Occlusal

36
Digestion in Oral Cavity
  • Ingestion
  • Mastication
  • Chemical digestion
  • Deglutition

37
Pharynx
  • Already did under Respiratory

38
Esophagus
  • Hiatus
  • Sphincters
  • Function
  • Peristalsis
  • Heartburn is actually esophageal burn

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Stomach (gastric)
  • Anatomy
  • Cardia
  • Fundus
  • Body
  • Pylorus and Pyloric Sphincter
  • Greater Curvature
  • Lesser Curvature

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Digestion in Stomach
  • Stores food
  • Chyme
  • Motility, Mixing Emptying
  • Peristalsis
  • To Pyloric Sphincter, to Duodenum
  • Pacemaker cells make smooth muscle contract about
    3x/minute when food present

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Controls of Stomach Motility
  • 2-6 hours to empty
  • Controls include volume distention
  • GASTRIN
  • Hormone released by pyloric cells in response to
    distention. Stimulates gastric motility.
  • Caffeine stimulates gastrin release

49
Controls of Stomach Motility
  • ENTEROGASTRIC REFLEX
  • As duodenum distends, it inhibits gastric
    motility
  • SECRETIN
  • CHOLECYSTOKININ
  • GASTRIC INIHIBITORY PEPTIDE

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Gastric Secretion
  • Juice
  • Zymogenic Cells make Pepsinogen
  • Parietal Cells make HCl
  • Alkaline blood following a meal
  • Mucus Cells make protective mucus

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Controls of Stomach Secretion
  • GASTRIN
  • Cephalic, Gastric Intestinal phase of seeing
    and eating food
  • ENTEROGASTRIC REFLEX
  • GIP, CHOLECYSTOKININ, SECRETIN

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Stomach Physiology
  • Very little absorption
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