We as humans have to deal with teamwork all of our lives. Even inside our bodies we have to deal with teamwork! The Excretory System teams up with the Digestive System because all that food and drinks that the digestive system breaks up the Excretory System has to get rid of the digested waist. Also the Excretory System has to work with the Muscular System too! The way they work together is when the mucles work out, the chemicles are then taken out through the skin witch is part of the Excretory System. Without the teamwork of the systems our bodies would not be functioning as it is right now!