Excretion: Expulsion of energy from a chamber
In the end stage of digestion, a large portion of chemicals are gathered within the large intestines; building up momentum on the walls of rectum. It takes some body strength with guides of fluids/lubricants to stir an expulsion stage.
The build-ups are timely parallel to the amount of energy gathered within the constrained system. The principle of excretion presented from this stage is coherent to the process in which chemicals are transfered from bowel to the intestines. All other functions are simultaneously taking place to create the momentum; which serves as a guide to the overall energy build-up in the rectum.
Walls of rectum compress and decompress to guide the chemicals off the system during excretion. When the chemicals are out of the system, energy are drained along - in the form of heat and other part of body strength.
