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NEPHRIDIA:-

In earthworm excretion occurs through nephridium. The excretory system in earth worm is closely associated with its closed circulatory system. Each segment of earthworm consists of a pair of nephridia or in some species cluster of nephridium.

NEPHRoSTOME:-

The colemic fluid or body fluid enters the nepridium through a membrane which is cilliated called nephrdiostome.

NEPHRIDIOPORE:-

The body fluid after reabsorption from the nephridia opens into a large bladder which opens to exterior through nephridiopore.

Ammonia and water are waste products excreted by nephridia while CO2 is excreted through general body surface.

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