Definition of organ system...,
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In unicellular organisms, all the functions are performed by a single cell. Whereas in complex organism they are mostly multi cellular and various Functions are done by various kinds of cells.
In the human body, there are billions of cells that perform various functions in the body. Such an organisation of complex system is very effective for the better coordination of various cell activities in the organism.
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An organ system is a group of organs that work together to perform a certain function in an organism's body. Most animals and plants have organs, which are self-contained groups of tissues such as the heart that work together to perform one function.
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