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J Appl Physiol 53: 1449-1454, 1982;
8750-7587/82 $5.00
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Journal of Applied Physiology, Vol 53, Issue 6 1449-1454, Copyright © 1982 by American Physiological Society

ARTICLES

Regulatory processes of metabolic and respiratory acid-base disturbances in embryos

H. Tazawa

First, preliminary experiments were designed in the 16-day-old individual chick embryo to elucidate the effect of electrolyte infusion and blood samplings on hemodilution, which might influence the acid-base balance. Three kinds of hemodilution were observed: 1) hemodilution caused by four repetitive samplings, which had no influence on acid-base balance; 2) hypervolumic hemodilution caused by infusion of solution whose volume equaled about 5-6% of total blood volume, which induced dilution acidosis; and 3) hypertonic hemodilution caused by hypertonic electrolyte infusion, which also induced dilution acidosis. The embryo recovered from the hypertonic dilution acidosis in 6 h after infusion, but it did not recover from hypervolumic acidosis. Second, the time course of changes in metabolic and respiratory acid-base disturbances was studied in the individual embryo. Metabolic acid-base disturbances made by hypertonic NaHCO3 infusion were restored to control state in 6 h. Respiratory acid-base disturbances were also regulated in terms of changes in plasma[HCO-3] and pH. The renal function and redistribution of HCO-3 may in part be responsible for the regulation.


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S. Khorrami, H. Tazawa, and W. Burggren
`Blood-doping' effects on hematocrit regulation and oxygen consumption in late-stage chicken embryos (Gallus gallus)
J. Exp. Biol., March 15, 2008; 211(6): 883 - 889.
[Abstract] [Full Text] [PDF]


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