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Control of red cell function of late chick embryos: role of extracellular ATP/AMP and egg size

Control of red cell function of late chick embryos: role of extracellular ATP/AMP and egg size role of EMBRYOS employ a variety of strategies to tailor the respiratory of the blood to the changing conditions for gas transfer during ontogeny. This includes switches of hemoglobin type, i.e., from to fetal or adult hemoglobin, as well as changes in concentration of metabolites, e.g., organic phosphates such as 2,3-diphosphoglycerate (2,3-DPG), which act as allosteric regulators of hemoglobin . In many vertebrates late stages of fetal development are characterized by progressive hypoxia. An increase of blood OZ affinity production are typical adaptive responses of the fetus. In avian development the OZ supply of late embryos is increasingly limited by the diffusional properties of the eggshell its membranes. In chick embryos the choriallantoic gas exchanger reaches its final size by the end of the 2nd wk of development. O2 uptake of late chick embryos is driven by increasingly large PO, gradients between ambient air chorioallantoic capillary blood. PO, of the chorioallantoic vein decreases from 90 Torr in midterm embryos to - 50 Torr at day 17 or 18 (32). Neverth e1 ess a OZ saturation of close to 90% is VERTEBRATE R542 0363-6119/94 $3.00 Copyright o 1994 maintained in the arterialized blood because of a continuous increase of http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png AJP - Regulatory, Integrative and Comparative Physiology The American Physiological Society

Control of red cell function of late chick embryos: role of extracellular ATP/AMP and egg size

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Publisher
The American Physiological Society
Copyright
Copyright © 1994 the American Physiological Society
ISSN
0363-6119
eISSN
1522-1490
Publisher site
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Abstract

role of EMBRYOS employ a variety of strategies to tailor the respiratory of the blood to the changing conditions for gas transfer during ontogeny. This includes switches of hemoglobin type, i.e., from to fetal or adult hemoglobin, as well as changes in concentration of metabolites, e.g., organic phosphates such as 2,3-diphosphoglycerate (2,3-DPG), which act as allosteric regulators of hemoglobin . In many vertebrates late stages of fetal development are characterized by progressive hypoxia. An increase of blood OZ affinity production are typical adaptive responses of the fetus. In avian development the OZ supply of late embryos is increasingly limited by the diffusional properties of the eggshell its membranes. In chick embryos the choriallantoic gas exchanger reaches its final size by the end of the 2nd wk of development. O2 uptake of late chick embryos is driven by increasingly large PO, gradients between ambient air chorioallantoic capillary blood. PO, of the chorioallantoic vein decreases from 90 Torr in midterm embryos to - 50 Torr at day 17 or 18 (32). Neverth e1 ess a OZ saturation of close to 90% is VERTEBRATE R542 0363-6119/94 $3.00 Copyright o 1994 maintained in the arterialized blood because of a continuous increase of

Journal

AJP - Regulatory, Integrative and Comparative Physiology – The American Physiological Society

Published: Aug 1, 1994

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