The glycogen in animal tissues has engaged the attention of physiologists since the early work of Claude Bernard. Its significance in health and in disease has also been the subject of scattered observations by clinical investigators since that time. This presentation is an attempt to summarize and correlate such physiologic and clinical aspects of the subject as may be of interest and importance to the practicing physician.
NATURE OF GLYCOGEN
Glycogen is a condensation product, or polymer, of dextrose (d-glucose). A molecule of glycogen is composed of twelve units of dextrose. some water being withdrawn in the process of condensation.1 This product is not peculiar to animal tissue. Starch is similar in its structure and chemistry. However, within the living cell glycogen exists in a characteristic state, which is different from that of glycogen in the chemist's bottle or of starch on the grocer's shelf. In its natural