Excretion in annelida long question for +3 zoology students
EXCRETION IN ANNILIDA - Excretion is defined as the separetion elimation of nitrogenus west from body to out side. - The organ involve in excretion called as ecretory organ. - In annelida exretion is brought about by these following organ. NEPHRIDIA - These are coild tubules arrenged segmentally drive from ectoderm and projected in the nephridia named as 1. proto-nephridia 2. meta-nrphridia A. PROTONEPHRIDIA - These are primitive type of nephridia open to exterior by an opening called nephridiapore. - Internaly it blindly open towords coelom and are branched. - Each branch ends in a tubular cell , called solencytes. - It is a cavity surrounded by cytoplasm mass. - Flagellum arises from the mass of cytoplasm. - It is found in alcepa. B. METANEPHRIDIA - It has two opening ,one end is open to the coelom by funnel like structure called nephrostome. - And orther end open to anterior by nephridiapore,found in nereis. - Nephridium colid tube
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