Abstract
Changes in the histogram of the midgut in bees exposed to lead and cadmium salts polluting their carbohydrate feed was studied. Normally , the mitgut is composed of the mucosa and muscular membranes separated with a thin layer of the basal membrane. The muscular membrane that forms the outer wall is a layer of cross-striated muscle symplasis intersecting in mutually perpendicular directions. On the mucous side, the muscular layer is delimited by a basal membrane and its outer side freely connects with internal environments of the abdominal region. Specific signs of lead poisoning manifest in the development of total and sub-total coagulative necrosis of the midgut mucous membrane. Its lesion in poisoning with cadmium is characterized by dystrophy expressed in cytoplasmic micro vesiculation which is followed by desquamation of the mucous membrane and destruction of glandular crypts.
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