title: The magnesium, calcium, sodium, potassium and chloride contents of the term human placenta.
abstract: The ion content of the human term placenta was determined. When ordered decreasingly according to their placental content, the series of ions was: Na greater than Cl greater than K greater than Ca greater than Mg. These levels, plotted as a function of the tissue dry weight, showed an exponential distribution. Using Cl as an extracellular marker, Na and K cellular concentrations were evaluated. The equilibrium potentials derived from these values were very different from the measured syncytial membrane potential or from the value usually recorded in non-innervated tissues.
authors.affiliation: Biologie de la Reproduction, Université P. et M. Curie, Paris, France.
authors.forename: J C
authors.initials: JC
authors.lastname: Challier
authors.forename: M
authors.initials: M
authors.lastname: Bara
authors.forename: P
authors.initials: P
authors.lastname: D'Athis
mesh_terms: D002118:Calcium / Q000032:analysis*; D002712:Chlorides / Q000032:analysis*; D005260:Female; D006801:Humans; D008274:Magnesium / Q000032:analysis*; D010920:Placenta / Q000032:analysis*; D011188:Potassium / Q000032:analysis*; D011247:Pregnancy; D012016:Reference Values; D012964:Sodium / Q000032:analysis*
chemical_list: D002712:Chlorides; D012964:Sodium; D008274:Magnesium; D011188:Potassium; D002118:Calcium