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How is the human body organized?

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The cell is the basic living unit of the human body—indeed, of all organisms. The human body consists of trillions of cells, each capable of growth, metabolism, response to stimuli, and, with some exceptions, reproduction. read more

carries messages back and forth between the brain and other parts of the body- Brain, spinal cord, or nerves. Connective tissue supports the body and connects all its parts, Blood, fat cartilage, bones, or tendons. read more

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