Reproductive system

the female reproductive system releases one (usually) egg and builds an environment to accommodate an embryo should that egg be fertilized. To generate an egg and construct a potential home for an embryo, the ovaries and uterus of the female reproductives system undergo a cyclical pattern of structural changes called the menstrual cycle. Changes in the ovary are called the ovarian cycle and changes in the uterus are called the endometrial cycle.