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Gastrointestinal (GI) System Overview

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  • Gastrointestinal (Digestive) System
    • Functions:
      • Digestion (breakdown) of food
        • The mechanical and chemical breakdown of macromolecule nutrients into smaller constituent parts 
        • Epithelial cells are specialized for the secretion of enzymes and other chemical substances that aid digestion 
      • Absorption of nutrients
        • Surface area of digestive tract is increased by structural arrangements in different regions 
      • Excretion of waste
        • Excretory system processes toxins and eliminates waste products of metabolism