1. Bellwork – name and state the function of each organ

2. Digestion and Evolutionary Adaptions

3. Suspension Feeders
Many aquatic animals are suspension feeders, which sift small food particles from the water

4. Substrate Feeders
Substrate feeders are animals that live in or on their food source

5. Fluid Feeders
Fluid feeders suck nutrient-rich fluid from a living host

6. Bulk Feeders
Bulk feeders eat relatively large pieces of food

7. Video: Hydra Eating Daphnia
Animals with simple body plans have a gastrovascular cavity that functions in both digestion and distribution of nutrients
Video: Hydra Eating Daphnia

8. This digestive tube is called an alimentary canal
Fig. 41-9
This digestive tube is called an alimentary canal
Crop
Gizzard
More complex animals have a digestive tube with two openings, a mouth and an anus
Esophagus
Intestine
Pharynx
Anus
Mouth
Typhlosole
Lumen of intestine
(a) Earthworm
Foregut
Midgut
Hindgut
Esophagus
Rectum
Anus
Crop
Mouth
Gastric cecae
(b) Grasshopper
Stomach
Gizzard
Intestine
Mouth
Esophagus
Crop
Anus
(c) Bird

9. Some Dental Adaptations
Dentition, an animal’s assortment of teeth, is one example of structural variation reflecting diet
dentition is adapted to their usual diet

10. Why might this have evolved?
Hint: the cecum has bacteria that breaks down plant material

11. Rumen Reticulum Intestine Esophagus Abomasum Omasum 1 2 4 3 Fig. 41-20
Figure Ruminant digestion 4
Abomasum 3
Omasum