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A body system is a collection of parts able to work together to serve a common purpose – growth, reproduction and survival. Leonardo da Vinci’s drawing of the Vitruvian Man (c. 1847) shows his interest in proportion. He believed the workings of the human body to be an analogy for the workings of the universe.
TL;DR (Too Long; Didn’t Read) The human body comprises 12 distinct human body systems, and their functions reflect their names: cardiovascular, digestive, endocrine, immune, integumentary, lymphatic, muscular, nervous, reproductive, respiratory, skeletal and urinary.