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The human body is a highly complex and dynamic system that functions as a whole to maintain life. It is made up of many different systems, each working together in harmony to keep the body functioning properly. The skeletal system provides support and structure for the body, while the muscular system enables movement and locomotion. The circulatory system transports nutrients and oxygen to cells throughout the body, and the nervous system transmits signals between the brain and other parts of the body. The digestive system breaks down food into nutrients that can be absorbed by the body, and the respiratory system brings oxygen into the lungs where it is exchanged for carbon dioxide. The endocrine system produces hormones that regulate various bodily functions, such as growth and development. In addition to these systems, the human body also contains a number of organs and tissues that work together to maintain overall health. The skin protects the body from external damage, while the immune system defends against infection and disease.