Digestive System Anatomy and Function

From the study guide

Course Outline

  1. Function of GI System
  2. GI Tract and Organs
  3. Accessory Digestive Organs
  4. Digestive Processes
  5. Peritoneum and Organ Relationships
  6. GI Histology Layers
  7. Enteric Nervous System
  8. Oral Cavity and Associated Organs
  9. Stomach Anatomy and Cells
  10. Liver, Gallbladder, Pancreas
  11. Small Intestine Structure
  12. Large Intestine Anatomy

1. Function of GI System

Key Concepts & Definitions

  • Ingestion: The process of taking food into the mouth for digestion.
  • Digestion: The series of catabolic steps involving enzymes that break down complex food molecules into chemical building blocks.
  • Absorption: The passage of digested fragments from the lumen of the GI tract into the bloodstream.
  • Elimination: The removal of indigestible substances and waste products from the body via defecation.
  • GI tract vs. Accessory organs: The GI tract (or alimentary canal) is a continuous muscular tube from mouth to anus that digests and absorbs nutrients; accessory organs (liver, gallbladder, pancreas, salivary glands) produce secretions aiding digestion but are not part of the tube itself.
  • Digestive processes overview: Ingestion (eating), propulsion (movement of food), mechanical breakdown (chewing, churning, segmentation), digestion (enzymatic breakdown), absorption (nutrient uptake), defecation (excretion of waste).

Essential Points

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Practice quiz preview

1. What IS the primary function of the liver among the accessory digestive organs?

2. How might a clinician apply knowledge of the enteric nervous system when treating a patient with a motility disorder?

3. Who is credited with first describing the histological structure of the small intestine?

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Flashcard preview

GI system — main functions?

Ingestion, digestion, absorption, elimination.

GI tract — primary role?

Propels food, digests, absorbs nutrients.

Accessory organs — examples?

Liver, gallbladder, pancreas, salivary glands.

Digestion — process?

Enzymatic breakdown of food molecules.

Peritoneum — function?

Supports organs, reduces friction, contains vessels.

Mucosa — layer?

Innermost, secretes mucus, absorbs, protects.

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Frequently asked questions

What does the Digestive System Anatomy and Function study guide cover?

It covers the core concepts of Digestive System Anatomy and Function, organized by topic with the key definitions, explanations and takeaways, so it's easier to learn and remember.

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How many questions are in the Digestive System Anatomy and Function quiz?

The practice quiz has 12 multiple-choice questions, each with an explanation. Use it to check what you know and find your gaps.

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How do I study Digestive System Anatomy and Function with flashcards?

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