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The reproductive system ensures the survival of the species. Other systems in the body, such as the endocrine and urinary systems, work continuously to maintain homeostasis for the survival of the individual. An individual may live a long, healthy, and happy life without producing offspring, but if the species is to continue, at least some individuals must produce offspring.
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The human ovary consists of an inner medulla and outer cortex with indistinct boundaries. The medulla contains the blood vessels and nerves, while the cortex is occupied by developing follicles. Visible in this ovary are follicles in various stages of development. Also visible is a corpus luteum, the remnants of a follicle that has burst and sent its ovum into the genital tract.
Source: http://medcell.med.yale.edu/systems_cell_biology/female_reproductive_system_lab.php