, Volume 393, Issue 1, pp 118-120

Direct measurements of oxygen tension at the surface of arterioles, capillaries and venules of the cerebral cortex

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Direct pO2 measurements were made at the surface of arterioles, capillaries, and venules of rabbit brain cortex. The results indicate that a considerable amount of oxygen diffuses through the arteriolar and precapillary wall. Therefore, the arterial blood that reaches the capillaries already has low pO2 (43±3 mm Hg and about 75%–70% of the blood oxygen capacity).