Digestion Intro to Unit Three
Four Parts of Digestion • Ingestion: the taking in of food • Digestion: the breaking down of complex molecules into simpler ones that can be used by the organism • Absorption: the transportation of digested nutrients to the cells of the body. • Egestion: the removal of wastes (undigested materials) from the body
How Do They Do It? • Different organisms digest food in different ways. • Your next task is to find out how they do it. You will be assigned an organism and you need to make a poster to explain how they digest their food. • As much as possible, try to break it up into the four parts of digestion that you just copied down.
Continued • Make sure you understand what you put on your poster. Don’t put down things that you couldn’t explain to me. • Also make sure they are readable as we’ll be putting them up on the walls once I’ve marked them. • Include pictures/diagrams to help your explanation. • Stay on task and monitor your time.
The Organisms • Sponge (ocean animal) • Hydra (fresh water animal) • Earthworm • Bird • Cow • Frog • Boa Constrictor • Venus Flytrap (carnivorous plant) • Starfish (carnivorous marine animal) • Dogfish shark • Tapeworm (parasitic animal) • Oysters (aquatic animal) • Rabbit • Spider
Links • Animal Kingdom - Internal and External Anatomy • Starfish Digestion • http://www.madreporite.com/science/digest.htm • http://marine-francine.blogspot.com/2007/11/starfish.html • Cow Digestion • http://wiki.answers.com/Q/How_does_a_cow's_digestive_system_work • http://www2.kenyon.edu/projects/farmschool/food/milkbio.htm • Carnivorous Plants • Venus FlyTrap • Bird Digestion • http://www.fernbank.edu/Birding/digestion.htm • http://www.thewonderofbirds.com/biology/digestive-system/
Links • Frog • http://www.biologycorner.com/worksheets/frog-dissection.html • http://www.tutorvista.com/biology/frog-digestive-system-diagram • http://www.e-tutor.com/et3/lessons/view/52133/print • Boa Constrictor (snake) • http://animal.discovery.com/guides/reptiles/snakes/anatomy_03.html • Hydra • http://www.cedarville.edu/personal/jwf/bio100/lecturequiz21b.swf • http://wiki.answers.com/Q/What_is_the_hydra_digestive_system_like • http://www.micrographia.com/specbiol/cnidari/hydrozo/hydr0100.htm • Earthworm • http://www.buzzle.com/articles/earthworm-digestive-system.html • Also – see links on Earthworm Exploration Activity!!!
Links… • Rabbit • http://www.hopperhome.com/rabbit_digestion.htm • http://www.petcaregt.com/rabbits/rabbitdigestivesystem.html • DogFish Shark • http://www.enchantedlearning.com/subjects/sharks/anatomy/Digestion.shtml • http://www.pc.maricopa.edu/Biology/ppepe/BIO145/lab04_1.html • http://campus.murraystate.edu/academic/faculty/tderting/anatomyatlas/RogersDay/evoldig.html