Types of Digestio1

Types of Digestio1 - accessory digestive organs o liver -...

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Types of Digestion types of digestive systems  - herbivores, carnivores, omnivores  sponges, unicellular organisms digest intracellularly other organisms digest extracellularly, inside digestive cavity gastrovascular cavity - found in cnidarians, flatworms o only 1 opening, no specialization specialization starts w/ development of digestive tract (separate mouth/anus) chemical digestion - hydrolysis reactions break down macromolecules in the food vertebrate digestive system  - has gastrointestinal tract + other digestive organs  mouth >> pharynx >> esophagus >> stomach >> small intestine (absorbs nutrients in food) >> large intestine o in mammals, urogenital and fecal matter separated in large intestine o in nonmammals, waste products go into cloaca cavity herbivores need longer intestines to digest plants properly (cellulose hard to break down) o ruminants - animals containing stomachs w/ separate chambers o cecum - pouch found at beginning of large intestine in some organisms for digesting cellulose
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Unformatted text preview: accessory digestive organs o liver - produces bile >> emulsifies fat o gallbladder - stores/concentrates bile o pancreas- produces digestive enzymes, bicarbonate buffer in pancreatic suit tubular gastrointestinal tract o mucosa - innermost layer, circular orientation o lumen - inside of tract o submucosa - outside of mucosa, linear orientation o serosa - covers outside of tract o plexus - region where nerves concentrated ruminant digestion - uses 4-chamber stomach rumen - 1st chamber, contains smaller reticulum o protists/bacteria convert cellulose into simpler compounds o rumination - regurgitating food to rechew after entering rumen reswallowed food goes through reticulum to omasum to abomasum food mixed w/ gastric juice within abomasums cecum digestion - used by rodents, horses, deer, lagomorphs (rabbits/hares) digestion of cellulose in cecum regurgitation not possible >> rodents/lagomorphs eat feces to digest a 2nd time (caprophagy)...
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Types of Digestio1 - accessory digestive organs o liver -...

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