Interactive effects of temperature and hypoxia on heart rate and oxygen consumption of the 3-day old chicken embryo

Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
J P MortolaKhalid Al Awam

Abstract

In the chick embryo at day 3, gas exchange occurs by diffusion and oxygen consumption (V(O(2))) does not depend on the cardiovascular convection of O(2). Whether or not this is the case in hypoxia is not known and represents the aim of the study. The heart of chicken embryos at 72 h (stage HH18) was filmed through a window of the eggshell by a camera attached to a microscope. Stroke volume was estimated from the changes in heart silhouette between systole and diastole. V(O(2))was measured by a closed system methodology. In normoxia, a decrease in temperature (T) from 39 to 31 degrees C had parallel depressant effects on V(O(2))and HR. At 39 degrees C, a progressive decrease in O(2) lowered V(O(2)); HR was maintained until the O(2) threshold of approximately 15%. In severe hypoxia (4% O(2)) V(O(2))and HR were, respectively, approximately 12% and approximately 62% of normoxia. At 32 degrees C the hypoxic threshold for HR was significantly lower. During constant hypoxia (7% O(2)) V(O(2))did not respond to T, while the HR response was preserved. Stroke volume changed little with changes in T or O(2), except at 6 and 4% O(2), when it decreased by approximately 20 and 30%. In embryos growth-retarded because of incubation in chronic h...Continue Reading

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Citations

Jun 5, 2013·Respiratory Physiology & Neurobiology·Jacopo P MortolaPaula A Toro Velasquez
Apr 26, 2011·Respiratory Physiology & Neurobiology·Marina V Nechaeva
Apr 12, 2011·Respiratory Physiology & Neurobiology·Jacopo P Mortola
Jan 26, 2012·Developmental Dynamics : an Official Publication of the American Association of Anatomists·Shi GuMichiko Watanabe
Oct 28, 2016·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Satoko Tomita IdeJacopo P Mortola
Mar 22, 2020·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Marina NechaevaIgor Kubasov

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