[The ultrastructure of dark and light thrombocytes].

Ultrastructure of thrombocytes with dark, light and intermediate hyaloplasm density has been studied in a population of thrombocytes of human peripheral blood. Excretion of specific granules, development of vacuolar structure, the increase in contact activity, and the cytochemical activity of phosphohydrolythic enzymes is accompanied by the corresponding decrease in the hyaloplasm density. Dark thrombocytes may be considered as potentially active ones, and the light ones, as actively functioning thrombocytes.