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LAS 9.pdf - BIO044: General Zoology (LAB) Module #9 Name: _...

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BIO044: General Zoology (LAB)Module #9Name: __________________________________________Section: _________Schedule: ______________________Class number: _________________Date: _________________________1FLM 1.0PLATYHELMINTHES (FLATWORMS)Lesson Objectives:At the end of the day, you will be able to:1.Describe the characteristics of flatworms;2.Identify the structures in the anatomy of a differentclasses of flatworms and their functionsMaterials:Ballpens, erasers, pencils, coloredpencils, dissection kit, masks, disposablegloves, petri dish, preserved specimens,reference books, and moduleReferences:Reece, J.B., et al. (2014). CampbellBiology: Concepts and Connections,9thedition. Pearson Publication.Hickman C.P., et al. (2008). IntegratedPrinciples of Zoology, 14thEdition.The McGraw-Hill Companies, Inc.New York.A.LESSON PREVIEW/REVIEWIntroduction (2 mins)Phylum Platyhelminthesare known as the flatworms. Among them are both free-living (livingprincipally in fresh or salt water) and parasitic species (mostly endoparasites). Parasitic flatworms are known asflukesandtapeworms, and they are widely distributed amount human beings and other vertebrates; they areoften pathogenic, and sometimes bring about the death of the host.Activity 1: What I Know Chart, part 1 (3 mins)(For this part, only answer the first column. Please leave the 3rdcolumn blank until you reach Activity 4 of this module.)What I KnowQuestions:What I Learned (Activity 4)1)What are the definingcharacteristics of a flatworm?2)What are the structuraladaptations found inparasitic forms of flatworms?Productivity Tip:Even though laboratory activities only focus on the morphology of the specimens, alwayskeep in mind who are the hosts of these parasites and the pathogens they carry.
BIO044: General Zoology (LAB)Module #9Name: __________________________________________Section: _________Schedule: ______________________Class number: _________________Date: _________________________2FLM 1.0B.MAIN LESSONActivity 2: Content NotesFlatwormsofPhylum Platyhelminthesexhibit many advances over the cnidarians. They aretriphoblastic, hence their structures are derived fromectoderm,endoderm, andmesoderm. The mesodermgives rise to all tissue between the epidermis and intestines (except the nervous tissue, which is from theectoderm).They are best characterized by having adorsoventrally flattened body. They are alsobilaterallysymmetrical. Internally, they do not have a body cavity (acoelomate). The only space inside their body is thelumen of their intestinal canal.The Platyhelminthes is the simplest phylum of animals that has now developed anorgan-system levelof complexity,but it still classified undertissue-organ levelas most of its organ-systems are still in itsprimitive state:Digestive system is incomplete, with only 1 orifice where food is taken in and waste isreleased.oAn exception to this is the parasitic tapeworms of Class Cestoda, which do not havedigestive systems at all and only absorbs nutrients through their epidermis.

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Term
Spring
Professor
NoProfessor
Tags
Cestoda, Flatworm, gravid proglottids, d Acetabulum, c Rostellum

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