The organ system is defined as group of organs that perform together to carry out specific functions of the body.
Each system performs a specific function. Digestive system is concerned with digestion of food particles. Excretory system eliminates unwanted substances. Cardiovascular system is responsible for transport of substances between the organs. Respiratory system is concerned with the supply of oxygen and removal of carbon dioxide. Reproductive system is involved in the reproduction of species. Endocrine system is concerned with growth of the body and the regulation and main tenance of normal life. Nervous system controls the locomotion and other activities including the intellectual functions.