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The human body is a complex and highly organized system that functions to keep us alive and healthy. It is made up of many different parts, each playing an important role in maintaining our overall well-being. At its most basic level, the human body is composed of 11 major systems, including the circulatory, digestive, endocrine, integumentary, lymphatic, muscular, nervous, reproductive, respiratory, skeletal, and urinary systems. Each system works together to perform a specific function that contributes to our overall health and well-being. The circulatory system, for example, is responsible for transporting oxygen and nutrients throughout the body. The digestive system breaks down food into nutrients that can be absorbed by the body. The endocrine system produces hormones that regulate various bodily functions, such as growth and development.