The paper presents the results of morphological examinations of the human cotyledons perfused in vitro and exposed to variable magnetic field (MF) during the 180-minute experiment. The cotyledon biopsies were collected immediately after perfusion and morphologically examined using the electron microscope. The control group C (10 perfusions) was not exposed to MF. In the experimental group E, (10 perfusions), the cotyledons were exposed to the 2mT, 50Hz variable magnetic field while in the experimental group E2 (10 perfusions) the 5mT, 50 Hz was used. In the groups E, and E2, numerous indentations of the sheath (areola) in the syntrophoblast nuclei were found, condensed (thickened) nuclear chromatin right beneath the sheath was substantially reduced and pyknosis was observed in some nuclei. The villi revealed widened vascular - epithelial membrane resulting from the oedema of the endothelial cells. Moreover, an increased number of collagen fibres in the villi and decreased number of active mitochondria were observed in the group E2
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