reproductive system reproductive system the reproductive system of an organism, also known as the genital system, is the biological system made up of all the anatomical organs involved in sexual reproduction. many non-living substances such as fluids, hormones, and pheromones are also important accessories to the reproductive system. unlike most organ systems, the sexes of differentiated species often have significant differences. these differences allow for a combination of genetic material between two individuals, which allows for the possibility of greater genetic fitness of the offspring. this article is about the reproductive system of all types of animals, including humans. for information specific to the human reproductive system, see human reproductive system. reproductive systemdetailsidentifierslatinsystema reproductionista98a09.0.00.000ta23467anatomical terminology animals