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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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During the menstrual cycle, the stratum functionalis grows and vascularizes before being sloughed off during menstruation, whilst the stratum basalis remains essentially stable. The myometrium permits the uterine cavity to expand and contract and is sensitive to the hormone oxytocin.
Reference: http://medcell.med.yale.edu/systems_cell_biology/female_reproductive_system_lab.php#:~:text=The%20vagina%20is%20lined%20by,vessels%20and%20nerves%20follows%20this.