The quantitative analysis of the circulation system providing O2 transport to the mammary tissues in 34 non-lactating and 21 lactating albino mice SHR revealed that the average values of O2 tension in the alveolar complexes (43.3 +/- 14.4 torr) were 1.4 times higher and those of the blood flow (134 +/- 39 Ml/100 gxmin) 2.0-4.5 times higher than the corresponding values in the local sites of non-secreting mammary glands. Rhythmical changes of the blood flow and O2 tension revealed in the alveolar complexes, had the average period (50-55 min) corresponding to the duration of the secretory cycle. Asynchronous changes of these parameters in various local sites of the gland suggest continuous redistribution of the blood flow in the gland.
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