Exretory System

Excretory System Aim: To examine and understand the structure, function and differences between different types of excretory systems. The difference between ‘excretion’ and ‘egestion’ is that whereas excretion is the process of removing toxic waste by-products of the body’s metabolism, egestion is the removal of indigestible remains/substances through the alimentary canal. Through egestion, substances that were not able to be used in the body are removed, and through excretion, waste products of used …

…end of the stomach and are blind at the other end. The nephridium is a structure found in earthworms, and most other segmented worms. They usually have a pair of excretory tubes in almost every segment of the body. Fluid from the body cavity enters the funnel shaped opening in one segment, then passes back into the next segment where the tube is surrounded by many blood vessels. Then the tube opens to the outside.