Q. How be able to the excretory system of annelids be described?
In each segment (metamere) of the being a pair of complete excretory structures known as metanephridium exists. The metanephridium has an extremity, the nephrostoma, which collects residuals from the coelom, causing reabsorption and filtering them along its extension similar to human nephron tubules. The material to be excreted goes out through a pore, the nephridiopore, which opens in the body surface.