Digestive System Anatomy and Function

📋 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