Abstract
Using a method of rapid freezing and freeze-drying, the chorioallantoic vascular plexus which plays an important role in embryonic gas exchange was investigated microscopically in connection with a microphotometric method for measuring reaction rates of O 2 or CO with the red cells in the chorioallantoic capillaries. The capillary bed forms a thin layer on the outer surface of the chorioallantoic membrane and has a fine reticulate formation, unlike that of the mammalian alveolar capillary. Length of the capillary between bifurcations is approximately the size of the blood cell. Therefore, the cells flowing zigzag through the capillaries are deformed within its walls. The number of blood cells in the capillary bed increases with the progress of incubation. These observations may relate to the daily increase in diffusing capacity in embryonic gas exchange and somewhat effect the reaction rate.
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