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C H A P T E R 28: Gastrointestinal Motility, General patterns of motility …

- - - - works on myenteric plexus
- - - - stellate mesenchymal pacemaker cells
        
        myenteric plexus
      - causes spike potentials which cause contractions
      - Affected by AcH, epinephrine
- - - - Phase 1- quiescent period
        
        Phase 2- period of irregular electrical and mechanical activity
        
        Phase 3- burst of regular activity
- - - - tractus solitarius & nucleus ambiguus
  - - - prevents GORD
      - release of Ach from vagus-contraction
      - NO & VIP from vagal cause relaxation
    - - pinchcock-like action
  - - - mixing with- hydrogen, hydrogen sulfide, CO2, methane
        
        sulfides make the smell