Digestve System

Digestve System

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Question Answer
Digestive System a.k.a Alimentary Canal or Gastrointestinal Tract
Functions of Digestive System (6) Ingestion, mechanical digestion, chemical digestion, secretion, absorption, and excretion
Ingestion occurs when materials enter digestive tract via the mouth
Mechanical Digestion crushing and shearing makes materials easier to propel along digestive tractINCREASES the surface area of the food in order to aid in chemical digestion
Chemical Digestion is the chemical breakdown of food into small organic fragments for absorption
Secretion is the release of water, acids, enzymes, buffers, and salts by epithelial cells by glandular org
Absorption movement of organic substrates, electrolytes, vitamins, and water , across digestive epithelium, into interstitial fluid of digestive tract , to be picked up by the capillaries
Excretion removal of waste products from body fluids
Layers of the GI Tract Mucosa, Submucosa, Muscularis, Serosa

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