Chapter 43

Chapter 43 - Chapter 43 Animals Employ a Digestive System...

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Chapter 43 Animals Employ a Digestive System to Prepare Food for Assimilation by Cells Herbivores : animals that only eat plants Carnivores : animals that only eat other animals Omnivores : animals that eat both plants and other animals Extracellular Digestion : digest food in digestive cavity, digestive enzymes are released into cavity that is continuous with outside environment Specialization: occurs when digestive tract, alimentary canal, has separate anus and mouth; digestion is only one-way Process: 1. stored in specialized regions of tract or physically fragmented. 2. Chemical digestion, breaking down macromolecules through hydrolysis reactions. 3. products pass through epithelial membranes of gut into blood absorption ; not absorbed are excreted through anus Vertebrate Digestive Systems Contain tubular gastrointestinal tract and accessory digestive organs Tubular Gastrointestinal Tract: o Layered Structure Inner: circular; Outer: longitudinally
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Chapter 43 - Chapter 43 Animals Employ a Digestive System...

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