What is the excretory system of annelids?
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.