These two systems work hand in hand, especially with the human body. The excretory system works in relation to how the digestive system works. Our digestive system is meant to digest- to intake the foods we feed out mouths which transport to our stomach. The digestive system is the lengthy process of our food reaching the place where it is fully digested. Once food is digested it expects the excretory system to perform its role. Our execretory system is meant to remove excess material and waste from our body. This usually ends with us in a bathroom .