Respiratory gas exchange of high altitude adapted chick embryos

Douglas Wangensteen, H. Rahn, R. R. Burton, A. H. Smith

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

Gas exchange by embryos from chickens acclimatized to an altitude of 3800 m (pB = 480 torr) was studied in order to ascertain the nature of the altitude adaptation in this species. The PO2 and PCO2 differences across the egg shell were measured and found to be less than the values previously reported for sea-level eggs by about a factor of two. Further measurements of embryonic oxygen consumption (O2 ) and shell conductivity to oxygen (GO2 ) indicated that, compared to eggs at sea level, O2 was reduced by a factor of 0.58 while GO2 was increased only by a factor of 1.07 in the high-altitude eggs. These independent measurements predict the ΔPO2 across the egg shell of the high-altitude eggs to be only 0.54 times that of sea-level eggs; the directly measured factor was 0.53. The authors conclude that at high altitude a major adaptation of the chick embryo is a reduced metabolism which decreases the ΔPO2 across the egg shell since its gas conductivity remains essentially unchanged.

Original languageEnglish (US)
Pages (from-to)61-70
Number of pages10
JournalRespiration Physiology
Volume21
Issue number1
DOIs
StatePublished - Jan 1 1974

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Chick Embryo
Eggs
Egg Shell
Gases
Oceans and Seas
Oxygen Consumption
Chickens
Embryonic Structures
Oxygen

Keywords

  • Air-cell O and CO
  • Altitude
  • Chick embryo
  • Diffusion coefficient
  • Egg shell porosity
  • Metabolism

Cite this

Respiratory gas exchange of high altitude adapted chick embryos. / Wangensteen, Douglas; Rahn, H.; Burton, R. R.; Smith, A. H.

In: Respiration Physiology, Vol. 21, No. 1, 01.01.1974, p. 61-70.

Research output: Contribution to journalArticle

Wangensteen, D, Rahn, H, Burton, RR & Smith, AH 1974, 'Respiratory gas exchange of high altitude adapted chick embryos', Respiration Physiology, vol. 21, no. 1, pp. 61-70. https://doi.org/10.1016/0034-5687(74)90007-3
Wangensteen, Douglas ; Rahn, H. ; Burton, R. R. ; Smith, A. H. / Respiratory gas exchange of high altitude adapted chick embryos. In: Respiration Physiology. 1974 ; Vol. 21, No. 1. pp. 61-70.
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