Abstract
The eighth Harold C. Mack Symposium was dedicated to updating the current state of knowledge on the placenta. Twenty-nine contributors from around the world have presented the results of their work in 16 chapters. Two of these are devoted to placental structure as studied by transmission and scanning electron microscopy. The authors present many observations but make little effort to correlate their findings with accrued information. Seven chapters consider placental transport and exchange mechanisms, and five deal with metabolic and endocrine functions of the placenta. Included in these detailed presentations are discussions of carbon dioxide transfer, glucose metabolism in the fetus and uterus, protein transport, steroid synthesis, and similar pertinent topics. Newer techniques and experimental approaches have permitted these investigators to work on aspects of placental function that, in the past, have been suggested but not proved. In addition, the authors introduce many new concepts. As was true of the
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