Topic 15 - Digestive system (B) Flashcards Preview

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Flashcards in Topic 15 - Digestive system (B) Deck (14):
1

Digestive system overview: 

  • includes
    • 1) Gastrointestinal (GI) tract
      • tube to mouth of anus
    • 2) Accessory organs
      • teeth, tongue, salivary glands
      • pancreas
      • liver, gall bladder

2

food into oral cavity

ingestion

3

  • large molecules broken down into smaller molecules
  • 2 types:
    • mechanical
    • chemical

4

end products of digestion enter blood or lymph

absorption

5

elimination of undigested material

defecation

6

what are the 4 basic layers of the gastrointestinal tract?

 

  1. Mucosa
  2. Submucosa
  3. Muscularis externa
  4. Serosa (or adventitia)

7

Gastrointestinal tract: 4 basic layers

Mucosa

  • how many layers? name them

  • 3 layers
    • epithelium with numerous goblet cells
    • lamina propria = areolar CT
    • muscularis mucosa

8

Gastrointestinal tract

Mucosa

3 layers: Epithelium with numerous goblet cells

  • stratified squamous: mouth pharynx, esophagus, anal canal
  • simple columnar: stomach, small + large intestines, rectum

9

Gastrointestinal tract

Mucosa

3 layers: Lamina propria = areolar CT

  • contains blood, lymph vessels, lymph nodules/tissues (immune)

10

gastrointestinal tract

Mucosa

3 layers: muscularis mucosa

smooth muscle - allows movement of mucosa

11

Gastrointestinal tract

Submucosa

  • areolar CT
  • contains: blood + lymphatic vessels, submucosal nerve plexus

12

Gastrointestinal tract

Muscularis externa

  • smooth muscle
  • inner circular layer
  • outer longitudinal layer
  • myenteric nerve plexus between layers
  • contractions cause motility (mixing + movement)

13

Gastrointestinal tract

Serosa (or adventitia)

cavity = lumen

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