Excretion In Earthworm: In earthworm excretory organs are "Metanephridia" A paired nephridia present in each segment. Each metanephridium has highly coiled tubule surrounded by blood capalaries. It has two opening internal (nephridiostoma) and external called nephridiopore which opens outside the body. Nephrostome has cilia that beating push the coelmic fluid into the tubule. The useful material reabsorbed by the blood capular and return to the body and finally the excretory fluid in the form of urine empitted in the bladder, which excretis outside by nephridiopore.
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