Excretion in human beings

Most of the unicellular organisms eliminate waste from their body through diffusion.

A lot of waste products produced in our body are in different forms that include carbon dioxide, water, and nitrogenous products like urea, ammonia, and uric acid. In addition to these, the chemicals and other toxic compounds from medications and hormonal products are also produced. A simple diffusion or evaporation will not be sufficient to eliminate the waste from our body.

As a result, in complex organisms such as animals, including humans, there is a specialized system for excretion called the excretory system.