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Digestive system - Coggle Diagram

- - - - mecosa membrane - produces mucus for reduction of friction and protections
      - epithelium
        
        varies by loaction
        
        nonkerantized stratied squamous in mouth , esophagus ,a nd anus , protection against friction
    - - areolar connective tissue containing major blood vessel
      - many elatic fibers to reatin shape
      - submucosal plexus
        
        automatic nerve supply
      - glands and lymphatic tissue
    - - two layers of smooth muscles to allow peristalsis and segmentation
        
        inner circular layer- squeeze decrease size of lumen ; in some areas act as sphincter or valves
        
        outer longitudinal layer-shortens intestine
      - mouth, pharynx , superior esophagus and anal sphincter- voluntary muscle
      - myenteric plexus - nerves
    - - outer covering of the GI tract
      - serous membrane
        
        composed of thin layer of areolar connective tissue and simple squamous epithelium
      - produces serous fluid for lubrication
- - - - contains salivary amylase - digest starch
      - three pairs of glands - parotid, submandibular ,sublingual
    - - goblet cells - produce mucus
      - chief cells - produce pepsinogen
        
        pepsinogen - in presence of hydrochloric acid , converts pepsinogen into pepsin
        
        pepsin - protein digesting enzyme in stomach
      - parietal cells - produces HCL and intrinsic factor
        
        intrinsic factor- needed for absorption of vitamin b12 in stomach
  - - - alkaline mucus to neutralize stomach acidd
        
        enzymes in duodenum digest all foods but require neutral ph to work
  - - - lipase ( digest fats)
      - pancreatic amylase ( carbohydrates)
      - trypsin and chymotrypsin (proteins)