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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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Ovarian ducts, also known as Fallopian tubes or oviducts, are tubes that connect the ovary to the uterus. They take the fertilized egg to the uterus, where it will be implanted and result in a pregnancy.
There are three layers to the ovarian duct walls: an inner mucosa, a middle muscular layer (smooth muscle), and an outside serosa. Closer to the ovary, the mucosa of the fallopian tubes is heavily convoluted. As the duct approaches the uterus, the folds shrink. A significant number of non-ciliated mucus-secreting cells cover the mucosa. The cilia beat in the uterus, providing a current that drives the oocyte forward.
Reference: https://uta.pressbooks.pub/histology/chapter/reproductive-system/