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. , Phylum: Platyhelminthe s Parasite Monster Inside Me Part 2
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., Phylum: Platyhelminthes Parasite Monster Inside Me Part 2.

Jan 04, 2016

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Page 1: ., Phylum: Platyhelminthes Parasite Monster Inside Me Part 2.

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Phylum:Platyhelminthes

Parasite Monster Inside Me Part 2

Page 2: ., Phylum: Platyhelminthes Parasite Monster Inside Me Part 2.

PlatyhelminthesOrigin of the word platyhelminthes: Latin for flatAnimals in this phylum include: tapeworms, planarians,

saltwater flatwormsLevel of organization: -organs and organ systems-Acoelomate (no body cavity)Symmetry: Bilateral (found in most higher organisms)

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Basic Platyhelminthes body planThree Germ Layers: First phylum to have all

three1) Ectoderm (outer)2) Endoderm (inner)3)Mesoderm (middle)

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Organ Systems

Digestive system: - Three branch system. - Gastrovascular cavity (same as cnidarians) - Gastro = digests food - Vascular = distributes food and gases like the circulatory system

Reproductive System:

Page 5: ., Phylum: Platyhelminthes Parasite Monster Inside Me Part 2.

Organ SystemsDigestive system: - Three branch system. - Gastrovascular cavity (same as cnidarians)- Gastro = digests food- Vascular = distributes food and gases like the

circulatory system

Reproductive System:- Hermaphrodite (carry both male and female

reproductive organs)

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Organ SystemsNervous System: - A ladder-like nerve network extending down from an anterior brain. Head- Anterior Eyespots detect light - Chemosensitive organs at auricles Note: Sensory functions collecting at the anterior end of an organism = Cephalization

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Organ SystemsExcretory System:Parts- A web of interconnected tubes that end in flame cells- Flame Cell: Contain beating cilia that create a continuous flow of water

out the excretory pore

Function- Waste moves out of the cells by diffusion and are pushed into the current

created by the flame cells which leads it out of the body through the excretory pore

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Platyhelminthes and ParasitismHalf of the flatworm species are parasiticTwo main groups of parasitic flatworms1)Tape worms:- Endoparasite- Adult stage survives in the intestine of a vertebrate hostParts: Scolex: Anterior end equipped with rings of hooks (B) and suckers (A) that hold onto host intestine.Proglottids: Reproductive segments (Carry eggs) released in feces

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Platyhelminthes and ParasitismCharacteristics that make tapeworms successful parasites1) Strong outer skin that resists breakdown by hosts digestive enzymes and acids2) Produces millions of eggs per day (only a few will make it to a proper host)

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Platyhelminthes and ParasitismFish tapeworm (Diphyllobothrium): - Found off the West coast of Canada and

Alaska (AKA here )- Reaches up to 30ft in length- Found in raw muscle meat of predatory fish

(eg. Salmon, trout)

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Tapeworm Lifecycle• Tapeworm lifecycle movie youtube

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Tapeworms

Prevention:Freezing meat at -10 C for several days kills the cysts ORCooking the meat thoroughly will kill cystsSymptoms:- Usually asymptomatic (4/5 cases)- Weight loss- Abdominal pain- Diarrhea- Vomiting- Fatigue

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Platyhelminthes and ParasitismTwo main groups of parasitic flatworms2) Flukes:- Endoparasite- Adult stage survives in the intestine of a vertebrate hostParts:- Oval shaped body similar to free living planaria with a reduced digestive and nervous systemTypes:Named after the organ they infect- Liver fluke- Lung fluke- Blood fluke

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Assignment

• Crossword• Vocab 628-629