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Lecture 8

lecture 8.odt

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Department
Biology
Course
BIO2135
Professor
All Professors
Semester
Winter

Description
Platyhelminthes an acoelomate triploblastL midterm cutoffcoelem fluid can be a cavity for nitrogenous wastes to buikld up in fluid then can filterBUT THIS GROUP NO COELUM DIFFERENT EXCRETORY STRUCTUREexcretory systemdiffusion across body surfaceprotonephridia water balance metabolic waste to a certain extentfilters interstitial fluid between cells Instead of coelomic fluidflame cellfiltering tuft of cilia inside flame cell push water down tube very thin membrance at junction between flame cell and tube cell get negative pressure from beating creating suction which draws fluid in Flame cell sits between cells bathed in interstitial fluidlarge components will not get in or leave main cells like food But smalls tuff and nitrogenous wastes will diffusemembrane surface pulling across it water and anything small enough to be dissolved in via action of cilialittle pores on side of animal allow wate
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