Body systems
Body systems The systems of the human body permit us to perform vital functions. Our bodies consist of a number of biological systems with specific functions necessary every day. There are different systems in the human body that help keep us functioning. The systems of the body include: the digestive, the circulatory, the excretory, the respiratory, the reproductive, etc. What is the most important system? What is the most interesting for you? Let's start with the digestive system. The digestive system Human beings need energy to live and function. We eat food to obtain energy. When we eat, our bodies digest the food and produce energy. Digestion is the process by which food substances are changed into nutritional substances necessary for our bodies. The digestive system consists of organs that allow (=permit) the body to absorb food and convert it into energy and basic nutrients, and remove waste. The digestive system includes the mouth, esophagus,...