Rock 021,022 and 023 (2013)

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The human body is a complex and highly regulated system that functions as a single unit. The central nervous system, including the brain and spinal cord, controls all bodily functions, while the peripheral nervous system transmits signals between the CNS and the rest of the body. The skeletal system provides support and structure for the body, while the muscular system enables movement through the contraction and relaxation of muscles. The circulatory system transports blood throughout the body, supplying oxygen and nutrients to tissues and organs. The respiratory system brings oxygen into the body through inhalation, while the digestive system breaks down food into its constituent parts for energy production. The endocrine system produces hormones that regulate various bodily functions, such as growth and development, metabolism, and reproductive processes. Overall, the human body is a highly integrated system that relies on the coordinated functioning of multiple organs and systems to maintain homeostasis and overall health.