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The human body is a complex and intricate system that consists of numerous organs, tissues, and systems working together to maintain overall health and well-being. The heart, lungs, liver, and kidneys are some of the key organs that play a vital role in keeping the body functioning properly. The nervous system, which includes the brain and spinal cord, controls voluntary movements, such as walking, talking, and writing, as well as involuntary actions like breathing and digestion. The immune system protects the body from foreign invaders, while the skeletal system provides support and structure to the body.