Gastrointestinal System

Overview

The gastrointestinal system enables ingestion, digestion, nutrient absorption, and waste elimination. Through coordinated mechanical and chemical processes, the digestive tract breaks down complex food into absorbable molecules while maintaining fluid and electrolyte balance. Gastrointestinal physiology integrates motility, secretion, enzymatic activity, and vascular supply to support whole-body metabolism.

Key Topics

This section covers the physiology of the mouth, stomach, small intestine, and large intestine, alongside hepatic function and vitamin regulation. Core concepts include salivary secretion, gastric function, intestinal digestion and absorption, defecation, and metabolic processes within the liver. Together, these topics explain how nutrients are processed, absorbed, and distributed to meet metabolic demands.

Clinical Relevance and Learning Focus

Disruption of digestive or absorptive processes can result in malnutrition, metabolic imbalance, and systemic disease. Understanding gastrointestinal physiology supports interpretation of symptoms such as dyspepsia, malabsorption, altered bowel habit, and metabolic dysfunction. This section emphasises integrated regulation across organs, helping learners connect digestive processes with systemic physiology and clinical presentation.