<prompt> True about oxytocin are all exceptSynthesized by paraventricular nucleus of hypothalamusSecreted by posterior pituitaryCauses uterine contraction of bodyCauses contraction of upper segment  <response>: Oxytocin is a hypothalamic hormone stored in and released from the posterior pituitary; it may also be prepared synthetically or obtained from the posterior pituitary of domestic animals. It acts as a powerful stimulant to the pregnant uterus, especially toward the end of gestation, and also causes milk to be expressed from the alveoli into the lactiferous ducts during breastfeeding.Ref: Ganong;s review of medical physiology; 24th edition; page no: 311 