Digestion
Why do we need food?
Food = Nutritional Molecules
- Fuel
- Building blocks (synthesis during tissue growth/cell turnover)
Feeding Mechanisms
DEPOSIT FEEDERS (detritivory)
CARNIVORES
HERBIVORES
SUSPENSION/ FILTER FEEDING
sessile aquatic animals, sponges, hydra
ENDOCYTOSIS
pgagocytosis or phenocytosis
amoeba
SURFACE ABSORPTION
taenia
Animals can either wait or forage for food
Problems: Undernourishment vs Overnourishment