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Digestion in Other Organisms. Week outline:. Monday: Digestion in Other Organisms Tuesday: Science Center & Body Worlds – have Fun! Wednesday: Digestive System Quiz Digestive System Problems Due (Page 284 #1-11 inclusive) Med School 101 Start Respiratory System

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week outline
Week outline:
  • Monday: Digestion in Other Organisms
  • Tuesday: Science Center & Body Worlds – have Fun!
  • Wednesday:
    • Digestive System Quiz
    • Digestive System Problems Due (Page 284 #1-11 inclusive)
    • Med School 101
    • Start Respiratory System
  • Thursday: Respiratory System
  • Friday: Respiratory System in Other Organisms
amoeba
Amoeba
  • One-celled organism
  • Does not have complex digestive system
  • Uses phagocytosis for engulfing and ingesting food
    • Requires energy from ATP
  • Surrounds food by extensions of cytoplasm called pseudopods
  • Once inside food is stored in a vacuole
amoeba1
Amoeba
  • Food vacuoles move with the amoeba
  • Enzymes that break down food are released into the vacuole
  • Specific pH within vacuole allows enzymes to work at optimum
earthworm
Earthworm
  • Regions in their alimentary canal differ by function
  • Worms burrow in ground – use prostomium to scoop soil
  • Muscular pharynx sucks soil into mouth
  • Nutrient-containing soil passes down esophagus
earthworm1
Earthworm
  • Nutrient rich soil is stored and moistened in the crop
  • No teeth – muscular gizzard: equipped with sand and gravel to help allow food from crop to enter (mechanical)
  • Organic matter is chemically digested & nutrients are absorbed
  • Indigestible material is eliminated through the anus
slide7
Bird
  • Have alimentary canal similar to worm
  • Able to eat a variety of food: insects, worms, berries, seeds
  • Have a crop for storing food
  • Have a gizzard for mechanically digesting food
  • Gravel in gizzard help grind food into digestible pieces
  • Chemical digestion in the stomach
  • Nutrients absorbed in the intestine
slide9
Cow
  • Ruminant mammals (cows, sheep, deer, etc) have more complex digestive system
  • 4 chambers
  • Because they digest cellulose (substance undigested by humans)
  • Cow chews & swallows mouthful of grass then food enters the rumen
  • Later travels into the reticulum
slide10
Cow
  • Bacteria in rumen and reticulum start to break down cellulose
  • Cow helps this process by regurgitating and re-chewing food from time to time
  • “Rumination” or “chewing of the cud” – softens & helps break down plant fibers, making them more accessible to bacteria and more digestible
digestive system practice problems
Digestive System Practice Problems
  • Page 284 #1-12 inclusive
  • Due Wednesday!
  • Reminder: Digestive System Quiz Wednesday!