Document Detail
The regulation of breathing in the chick embryo /
Abstract/OtherAbstract :
From the onset of internal pipping (i.e. embryonal breathing of air cell gas) until hatching, the chorioallantoic membrane (CAM) and the lungs work simultaneously to serve the metabolic needs of the embryo. (1) The carbon dioxide and oxygen exchange rates (V˙O2 and V˙ CO2) through the lungs and the CAM were separately, but simultaneously, measured during the last two days of incubation (day 20--21), while ventilation (V˙E) was calculated from the measurements of pressure oscillations in the air cell. When the embryo's total metabolic rate was increased, V˙E was linearly proportional to lung V˙ O2 and V˙CO2 and not to the embryo's total metabolic rate. (2) Tracheal pressure and changes in lung volume were quantified through mechanical ventilation of the embryo. The curled up posture of the embryo, the eggshell and its membranes did not represent a significant mechanical constraint to V˙E. (3) V˙ E, lung V˙O2 and V˙CO 2 were measured while the CAM compartment was exposed to either 10% O2, 100% O2 or 5% CO2. Total V˙ O2 was also measured under these conditions. There is a clear V˙ E-sensitivity to CO2 and a rather weak V˙E-sensitivity to changes in arterial oxygenation present at this stage of development.
Authors :
Menna, Tara Marisa.
Related Documents :
10303873 - Gradients of intercellular co2 levels across the leaf mesophyll 1
36613153 - The regulation of breathing in the chick embryo /
31098153 - Coral endolithic algae: life in a protected environment
Contributors :
Mortola, Jacopo P. (advisor)
Publication Detail :
Publisher :  McGill University     Type :  Electronic Thesis or Dissertation     Format :  application/pdf    
Date Detail :
Subject :
Biology, Animal Physiology.
Coverage :
Relation :
alephsysno: 001863590, proquestno: MQ78928
Source :
Copyright Information :
© Tara Marisa Menna, 2001
Other Details :
Languages :  en    
Export Citation :
APA/MLA Format     Download EndNote     Download BibTex

Previous Document:  Forward skating in ice hockey : comparison of EMG activation patterns of [sic] at three velocities u...
Next Document:  Role of nitric oxide in maintenance of endothelial cell and vascular viability under oxidant stress