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Final

Final_Exam_-_Nematoda.doc

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Department
Biology
Course
BIO2135
Professor
All Professors
Semester
Winter

Description
NematodaEcdysozoaBilaterally symmetric pseudocoelomate Animals that have a body cavity that is not completely lined by mesoderm so intestine not lined with muscle in wormsThe body is covered with a collagenous cuticle produced by an underlying epidermis syncytial This creates a multinucleate cellular appearance for a tissue that appears to lack cell boundaries in some species Nematodes dont have excretory organs although there is some evidence that renette cells found in some species may be involved in either excretion or osmoregulationGas exchange occurs across the cuticle which in parasitic forms is also important for absorbing nutrients from their host A nerve ring surrounding the pharynx is connected to four or more nerve cords that run the length of the animal Nematodes instead of having nerves that connect the nerve cord to muscles the muscles extend their own arms cytoplasmic extensions to connect with the nervous system Sensory amphids An external pore leads to an inner chamber and the sensory receptor forme
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