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Description: Prostaglandin is transported from the uterus to the ovary without passing through the lungs were it would be metabolized. This is possible because of the close apposition of the ovarian arteries and uterine veins shown in this image. The arteries are approximately 0.5 mm in diameter. The veins and arteries were injected with colored latex and the surrounding tissue digested away to produce this specimen which was kindly prepared by Dr. Robert Abrahams.