The circulatory and respiratory systems work together to maintain homeostasis. The respiratory system moves gases into and out of the blood while the circulatory system moves blood to all parts of the body. The circulatory system deliver oxygen-rich blood to the bones while the bones are making new blood cells. These system maintain internal stability and balance.
The digestive system breaks down the food into molecules. In cellular respiration, plants and animals convert those food molecules into a form of energy that they can use. It contain. The presence of bacterial flora in the intestine are needed to maintain homeostasis in the body by producing vitamins such as biotin and vitamin K and guard the system so that harmful bacteria will not be able to enter.