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  1. Upper vs. Lower GI Tract: What Are They? - Austin Gastroenterology

  2. Upper GI Tract Anatomy: Overview, Gross Anatomy, Microscopic ... - Medscape

  3. Upper GI Series: Definition, Procedure & Tests - Cleveland Clinic

  4. All About the Upper GI Tract - Birmingham Gastroenterology Associates

  5. Gastrointestinal tract - Wikipedia

  6. Upper GI Series: Purpose, Procedure, Risks, and Results - WebMD

  7. 18.4: Upper Gastrointestinal Tract - Biology LibreTexts

  8. Upper GI Issues Versus Lower GI Issues: What’s The Difference?

  9. The Gastrointestinal Tract - TeachMeAnatomy

  10. Upper digestive tract: Histology and clinical aspects - Kenhub