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Name: ______________________ Date: ________ Unit 5 Notes #5 Phylum __________________ (Nematoda) ________________ A) Body Plan: -____________________ worms that are cylindrically shaped. - Most are _____________________ but our focus will be on those that are _____________________ Similarities to Platyhelminthes: 1.______________________________________ 2. ________________________________(__________________ specialized to give rise to muscle and various internal organs) 3. ___________________________________________(protection) Differences: - __________________________________________(mouth to anus). -Between the mesoderm and the gut is a _______________________________called a ____________________________(“False Cavity”) B) Continuity-____________________: -________________________________________ in most roundworms. - In the female, there is a pair of long, thin, coiled ____________that produce thousands of __________ every day. - In the male, there is one________________; its job is to produce ____________. - After the eggs are fertilized, ______________________secrete a __________around the egg so when they are released they will be ___________________ C) Various Systems: 1. _________________: -_____________________ have a complete digestive system so materials move in one direction only - _____________________________ -As food is pushed through the digestive tract, it is ____________________________ __________________________Undigested remains continue on through the tract and are eventually eliminated out the __________. 2. Circulation & Respiration - No circulatory or respiratory systems. - Breathe and excrete metabolic ___________ through their ____________________ -_______________________________________________________________________ __________________________________________________________________ . D) Advances of _________________________________________________________ 1) They have a complete gut; _____________________________digestion. 2) They are ______________________ (___________________________) and they _________________________________________. 3) They have a fluid filled body cavity (_______________________), which contains their internal organs. The fluid in this cavity helps distribute materials and also _______________________________________________________________________ _______________________________________________. E) Roundworm Human Disorders 1) __________________________: “Guinea worms” form ulcerating blisters in human skin. 2) ______________________: The “___________________________”_____________ ________________________. This causes massive swelling and deformities. _______ worms are a close relative of Filarial worms. Most often _______________________ ______________________ insects (mosquitoes). Elephantiasis Eye worms 3) ______________________________: “__________________”: Larvae invade Human hosts by using hooks to burrow through the skin of bare feet to find their way_______________________________. From there they ____________________ _______________________where they burrow into the air passages of the lungs. They then travel to the throat, where they are swallowed and come to ____________ __________________________________. - These parasites__________________ __________, leaving the host (human) short of blood therefore____________ __________________ due to a reduction in the number of red blood cells. Hookworm Mouth Many such hookworms belong to the Genus “________________” Bolus of Ascaris worms rectally passed 4) ____________________: -From the “Trichinella worm” - ___________ host when __________________________________________________ - Set up in the _______________________ - After mating the worms can produce up to 1500 microscope ___________which burrow into the host’s blood vessels. - After traveling in the blood vessels they ___________________________ (pig, _____________________etc) tissues (_______________________). There they form _________________________