Lecture%2014.outline.Animal%20Nutrition

Lecture%2014.outline.Animal%20Nutrition - Animal Nutrition...

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Unformatted text preview: Animal Nutrition Learning Objectives Recreate the pathway of digestion in humans from the mouth to the anus. Describe the role of each organ and the major enzymes, hormones, etc. involved in digestion in each organ. Use your knowledge of human digestion to make predictions about digestion in other animals. Describe how H. pylori cause ulcers. Use your knowledge of homeostatic systems to understand the control of digestion by gastrin. Three Types of Digestive Mechanisms in Animals Phagocytosis Gastrovascular cavity Digestive tract From lecture on Animal Evolutoin Azure vase sponge (Callyspongia plicifera) Spongocoel Osculum Pore Epidermis Water flow Mesohyl Choanocyte Flagellum Collar Food particles in mucus Choanocyte Amoebocyte Phagocytosis of food particles Spicules Amoebocytes Phagocytosis Food particles, such as bacteria, stick to the mucus in the collar cells. Those food particles are then taken up through the membrane of the choanocyte by a process called phagocytosis. The food is either digested in the choanocyte or moved to the amoebocyte which delivers the food to other cells in the sponge cell body. Fig. 22-04 in your textbook Food (water Flea) Gastrovascular Cavity Food particle engulfed Single opening Gastrovascular cavity Hydra Captured prey are stuffed into the gastrovascular cavity through the mouth. Cells lining the gastrovascular cavity secreted digestive enzymes into the cavity, breaking down the prey into smaller pieces. These food particles are then engulfed by other cells lining the gastrovascular cavity and the pieces are further digested, as they are in phagocytosis in the sponges. Fig. 22-04 in your textbook Alimentary Canal (Digestive Tract) Interior of intestine Earthworm Intestine Mouth Anus An alimentary canal is a digestive tube extending between two openings, a mouth and an anus. Because food moves along the tube in a single direction, the tube can be organized into specialized compartments that carry out digestion and absorption in a stepwise fashion. Silicea Metazoa Eumetazoa rifera Bilateria Deuterostomia Lophotrochozoa Ecdysozoa Calcarea Ctenophora Cnidaria Acoela Echinodermata Chordata Platyhelminthes Rotifera Ectoprocta Brachiopoda Mollusca Annelida Nematoda Arthropoda Animal Body Plan Fig. 32-11, Campbell, Biology Compare to Figure 17.6 in your book No symmetry No tissues Radial symmetry Diploblasts Bilateral symmetr y Triplo- blasts Fig. 22-05Fig....
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Lecture%2014.outline.Animal%20Nutrition - Animal Nutrition...

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