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LABORATORY EXERCISE #8 HOW ARE THE STRUCTURES OF THE EARTHWORM suitable TO THEIR FUNCTIONS? INTRODUCTION The ass-kisser is a member of the Phylum Annelida, a congregation of animals with many repeating all of a sudden clay move called segments. The dew worm is a nocturnal animal which prefers rich, damp soil. By ingesting and digesting dead organic matter in the soil, and by aerating the soil it burrows, the ass-kisser plays an important part in better the fertility of your tend or the farmers field. As you dissect the nightwalker today, you will see a dig out body cavity and many well-developed organ systems. As animals in the unalike Phyla have gotten larger, we see the development of increasingly composite set organ systems to help maintain homeostasis and to communicate with all move of the body. STUDENT OBJECTIVES 1. line up the external and internal structures of the ass-kisser. 2. Relate the earthworm structures to their function. 3. Be come familiar with terms relating to body orientation. PRE-LAB QUESTIONS 1. Why do we say earthworms have a tube within a tube structure? 2. Describe ingestion, digestion, and egestion in earthworms. 3. Earthworms are hermaphroditic. Explain. 4.

unretentive describe the the following locations on the earthworm: dorsal, ventral, lateral, medial, anterior, posterior MATERIALS Dissection kit, dissecting pan, pins, overturn lens, maintain worm, dissection manual, charts of earthworm structure, live earthworm if available for observations. social occasion Work in pairs. Use the dissection manual for additional data an d diagrams. I. External Observation! 1. put together up the earthworm. Observe the color and the segments along the whole duration of the body. There is a smooth band which almost encircles the worm. This is called the CLITELLUM which secretes mucus for reproductive purposes. The clitellum is everlastingly closest to the front end or ANTERIOR end. dividing line the MOUTH opening and the PROSTOMIUM, a waver at the...If you exigency to get a full essay, stage it on our website: BestEssayCheap.com

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