Organs are structures made up of two or more tissues organized to carry out a particular function, and groups of organs with related functions make up the different organ systems. ... At each level of organization—cells, tissues, organs, and organ systems—structure is closely related to function.
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Organs are structures made up of two or more tissues organized to carry out a particular function, and groups of organs with related functions make up the different organ systems. ... At each level of organization—cells, tissues, organs, and organ systems—structure is closely related to function.