<prompt> What is the rate of uterine blood flow at term in a primigravida?50-75 mlmin150-200 mlmin350-400 mlmin500 mlmin  <response>: At term, uterine blood flow represents about 10 of the cardiac output, or 600-700 mLmin compared with 50 mLmin in the nonpregnant uterus. Eighty percent of uterine blood flow normally supplies the placenta; the remainder goes to the myometrium. Pregnancy maximally dilates the uterine vasculature, so that autoregulation is absent, but the uterine vasculature remains sensitive to -adrenergic agonists. Also know: Uterine blood flow is not usually significantly affected by respiratory gas tensions, but extreme hypocapnia PaCO2 Three major factors decrease uterine blood flow during pregnancy: 1 systemic hypotension, 2 uterine vasoconstriction, and 3 uterine contractions. Ref: Butterwoh IV J.F., Mackey D.C., Wasnick J.D. 2013. Chapter 40. Maternal Fetal Physiology Anesthesia. In J.F. Butterwoh IV, D.C. Mackey, J.D. Wasnick Eds, Morgan Mikhails Clinical Anesthesiology, 5e. 