The magnesium, calcium, sodium, potassium and chloride contents of the term human placenta |
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Authors: | J C Challier M Bara P D'Athis |
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Affiliation: | Biologie de la Reproduction, Université P. et M. Curie, Paris, France. |
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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. |
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