Digestive System Function: to obtain nutrients. Digestive System Function: obtaining nutrients. Activities of Digestion system: Ingestion – taking food or liquid into the mouth (eating or drinking). Movements Peristaltic and Segmentation Digestion Mechanical mastication
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to obtain nutrients
Function: obtaining nutrients
The Digestive System
1. Tunic Mucosa
2. Tunic Submucosa
3. Tunica Muscularis Externa
4. Tunica Serosa (or Adventitia*)
Serous membrane – visceral peritoneum
Histology of the G.I. Tract
Only example of gomphosis joint
Pulp Cavity with Pulp
Pharynx and Esophagus
Epiglottis closes over larynx
Tunica muscularis has three layers of muscle
Tunica mucosa has folds, rugae when empty
Histology of Gastric glands
Chief - Pepsinogen; Parietal - HCl; Neck/Mucous Cells
Increase Surface Area for Absorption
Diagrammatic view highlighting the distinguishing features of each region of the small intestine.
Ilieum: lymphatic aggregations (Peyer’s patches)
Histology of Large Intestine
Lack of villi
Abundance of goblet cells
Mucous-secreting intestinal glands
Muscularis reduced to Taenia coli
Rectum and Anal canal
Other digestive organs
Horizontal section through the upper abdomen showing the position of the liver relative to other visceral organs.
Diagrammatic view of lobular organization.
Isles of Langerhans