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Gas exchange in the pregnant uterus

BARTELS, Uterus MOLL AND WALDEMAR Heart Research Laboratory, University Oregon Medical School, Portland, Oregon, and Physlogisches Imtitut, Medi&ische Hochschule, Hannover, Germany Physlogical and Anatomical Determinants Placental Oxygen . ....... Physlogical basis transplacental oxygen tensn gradient .................. Structural characteristics placental membrane. ........................... .................... Comparative Physlogy Placental Oxygen . . .............................................................. M~acamulatta ......................................................... Sheep ................................................................. Goat .................................................................. Rabbit ................................................................ Dog .................................................................. ............................................................ Summary. Special Features Carbon Dxide in the Placenta. ................ Resistance to carbon dxide from fetal to maternal blood. .......... Physlogical basis transplacental carbon dxide tensn gradient. .......... Transplacental carbon dxide tensn gradient. .......................... ....................................... Regulatn Placental Gas . ................... Efficiency the Placenta With Regard to Oxygen . Medical Implicatns. .................................................... 783 785 793 802 804 808 810 814 816 818 819 819 826 822 826 828 832 833 :. MAMMALIAN VIVIPAR~Y DEPENDS for its success on the placenta, an organ designed to provide an environment sui for development the embryo, until birth. The complexity the mammalian placenta and the maternal and fetal mechanismsthat are necessaryfor it to functn led early observersto doubt that oxygen was available to the growing fetus. Arantius (7) in 1564 recognized that the maternal and fetal circulatns remain separate within the uterus. In 1667 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physiological Reviews The American Physiological Society

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