Heart, Circulation, Respiration and Blood; Environmental and Exercise Physiology Letters and Notes

Pflügers Archiv

, Volume 393, Issue 1, pp 118-120

First online:

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

  • K. P. IvanovAffiliated withPavlov Institute of Physiology, USSR Academy of Science
  • , A. N. DerryAffiliated withPavlov Institute of Physiology, USSR Academy of Science
  • , E. P. VovenkoAffiliated withPavlov Institute of Physiology, USSR Academy of Science
  • , M. O. SamoilovAffiliated withPavlov Institute of Physiology, USSR Academy of Science
  • , D. G. SemionovAffiliated withPavlov Institute of Physiology, USSR Academy of Science

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Abstract

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).

Key words

Arteriolar and precapillary O2 diffusion capillary pO2 brain cortex microvessels