1. Animal Nutrition I (Ch. 41)

2. Keywords Heterotroph Autotroph Herbivore Carnivore Omnivore Intracellular digestion Food vacuole Extracellular digestion Gastrovascular cavity Alimentary canal Basic parts of alimentary canal Roles of mouth and stomach in digestion

3. Some of the best known and fascinating adaptations of animals involve their feeding and digestion

4. Examples: Reptile swallowing prey Baleen whales

5. Python

6. Starfish

7. Chiasmodon niger

8. Cryptopsaras couesi

9. Eurypharynx pelecanoides

11. Categories I. Autotroph II. Heterotroph –A. Herbivore –B. Carnivore –C. Omnivore

12. Today we’ll focus on heterotrophs: Digestion Basic principles Invertebrates Humans

13. Why is digestion necessary? Macromolecules cannot easily enter cell COO- NH3+ cytoplasm Cell membrane peptide

14. Small molecules such as amino acids can cytoplasm Cell membrane Peptide being digested

15. cytoplasm Cell membrane Peptide being digested

16. cytoplasm Cell membrane Peptide being digested

17. cytoplasm Cell membrane Peptide being digested

18. cytoplasm Cell membrane Digested peptide

19. Even if macromolecules are taken in… COO- NH3+ cytoplasm Cell membrane peptide

20. Even if macromolecules are taken in… COO- NH3+ cytoplasm Cell membrane peptide

21. They cannot be readily incorporated COO- NH3+ cytoplasm Cell membrane Food peptide New peptide

22. Unless broken down first cytoplasm Cell membrane Food peptide New peptide

23. Unless broken down first cytoplasm Cell membrane Food peptide New peptide

24. Unless broken down first cytoplasm Cell membrane Food peptide New peptide

25. This lecture will focus on how animals break down food I. Intracellular digestion –A. food vacuoles II. Extracellular digestion –A. outside organism –B. gastrovascular cavity –C. alimentary canal

26. I. Intracellular digestion A. food vacuoles

27. Intracellular digestion without vacuoles

29. Intracellular digestion with vacuoles

32. Digestion in Paramecium

33. Intracellular digestion vs. Extracellular digestion

34. Extracellular digestion A. outside organism B. gastrovascular cavities C. alimentary canal

35. Extracellular digestion A. outside organism B. gastrovascular cavities C. alimentary canal

36. Gastrovascular cavity: Hydra

37. Extracellular digestion A. outside organism B. gastrovascular cavities C. alimentary canal

38. Gastrovascular cavity vs. Alimentary Canal

39. Alimentary canal: a simple view

40. mouth Mechanical digestion storage absorption anus Basic parts of alimentary canal

41. Alimentary canal: mammalian

42. Mouth Mechanical enzymatic

43. Stomach

44. Digestive mechanisms in stomach Mechanical Chemical enzymatic