Bellwork – name and state the function of each organ

Digestion and Evolutionary Adaptions

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

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

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

Bulk Feeders Bulk feeders eat relatively large pieces of food

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

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

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

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

Rumen Reticulum Intestine Esophagus Abomasum Omasum 1 2 4 3 Fig. 41-20 Figure 41.20 Ruminant digestion 4 Abomasum 3 Omasum