Animals are complex organisms made up of many organs that interact in order to work. These organs are linked together in what is called systems that have specific functions in the body. There are ten systems in the body not including the skin, the skeletal, muscular, cardiovascular respiratory, lymphatic, digestive, eliminatory, reproductive, nervous, and endocrine.
Each system supports the other to form organisms like mammals and insects. Most mammals have the same systems but not all function or are located in the same place in the body.
The skeletal system is made up of the bones and supports the structure of the body. The muscular system controls the movement of the bones. The cardiovascular system regulates the flow of blood. The lymphatic system works in conjunction with the cardiovascular system to secure immunization by filtering toxins, to rid the body of excess fluids and is the vehicle for proteins, fats and some vitamins. The digestive system processes foods. The eliminatory system disposes of the waste after the food is digested. The reproductive system maintains the existence of the species. The nervous system transports signals from different parts of the body to the brain. The endocrine system regulates the other systems by excreting hormones.