The staff of the Department is engaged in research projects dealing with the structure of the respiratory organs and placenta under experimental and pathological conditions. The ultrastructural and histochemical changes of the cells and tissues due to the administration of some foreign agents and diagnostic and therapeutic procedures are especially studied. To study changes in the composition of the secretory products, methods of conventional and lectin histochemistry are used. In co-operation with the Centre for Experimental Cardiovascular Research, the Department participates in the research of pulmonary and foetoplacental circulation changes in acute and chronic hypoxia.