<prompt> Largest amounts of prostaglandins are seen inSeminal fluidCSFBloodUrine  <response>: Largest amounts of prostaglandins are seen in seminal fluidEach seminal vesicle is a touous, loculated tube lined with a secretory epithelium that secretes a mucoid material containing an abundance of fructose, citric acid, and other nutrient substances, as well as large quantities of prostaglandins and fibrinogen.Prostaglandins are believed to aid feilization in two ways: 1 by reacting with the female cervical mucus to make it more receptive to sperm movement and 2 by possibly causing backwards, reverse peristaltic contractions in the uterus and fallopian tubes to move the ejaculated sperm toward the ovariesGuyton 13e pg: 1020 