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The human body is a complex and intricate machine that functions on a multitude of levels. The nervous system, for example, is made up of billions of neurons that communicate with each other through electrical impulses. These impulses are generated by the movement of ions across cell membranes, which ultimately leads to the transmission of information throughout the body. The muscular system, on the other hand, is responsible for movement and locomotion. Muscles work together in pairs to produce movement, with one muscle contracting while its opposing muscle relaxes. This contraction and relaxation of muscles allows for a wide range of movements, from simple actions like walking to complex actions like writing. The skeletal system provides support and structure for the body. Bones are made up of a hard outer layer called compact bone, which surrounds a softer inner layer called cancellous bone. The skeletal system also protects vital organs such as the heart, lungs, and brain. In addition to these systems, the human body has a number of other vital functions that keep it running smoothly. These include the circulatory system, which pumps blood throughout the body; the digestive system, which breaks down food into nutrients; and the respiratory system, which brings oxygen into the body and removes carbon dioxide.