2019年9月3日 · Next the geese were fitted with instruments to measure their heart rates and arterial and venous P O2 and made to fly in a wind tunnel mimicking the conditions of high-altitude flight. They also wore masks to measure their metabolic rates during flights where the oxygen levels were adjusted to correspond to sea level (21% O 2 ) and altitudes of ...

2019年9月3日 · Metabolic rate during flight increased 16-fold from rest, supported by an increase in the estimated amount of O 2 transported per heartbeat and a modest increase in heart rate. The geese appear to have ample cardiac reserves, as heart rate during hypoxic flights was not higher than in normoxic flights.

2018年9月9日 · Here, we report a detailed analysis of O 2 equilibria and kinetics of native major HbA and minor HbD isoforms from bar-headed goose and greylag goose ( Anser anser ), a strictly lowland species, to identify and characterize the mechanistic basis for the adaptive change in …

2010年7月1日 · The Andean goose (Chloephaga melanoptera) normally resides at altitudes above 3000 meters and flies to elevations as high as 6000 meters where O2 becomes limiting.

2013年6月15日 · We found that blood-O2 affinity was highly temperature sensitive in bar-headed geese compared with other birds and mammals. Based on our analysis, temperature and pH effects acting on blood-O2 affinity (cold alkalotic lungs and warm acidotic muscle) could increase O2 delivery by twofold during sustained flapping flight at high altitudes ...

2009年7月30日 · The bar-headed goose’s muscle cells have evolved to make more efficient use of low oxygen levels at high altitudes.

2019年9月3日 · Metabolic rate during flight increased 16-fold from rest, supported by an increase in the estimated amount of O 2 transported per heartbeat and a modest increase in heart rate. The geese appear to have ample cardiac reserves, as heart rate during hypoxic flights was not higher than in normoxic flights.

We have measured the partial pressure of O2 at 50% saturation (P50) and the concentration of various phosphate compounds in the erythrocytes of the bar-headed goose and the guanaco to establish the cause of the high blood O2 affinity in animals who normally reside at high altitude.

2017年3月24日 · The Andean goose (Chloephaga melanoptera) normally resides at altitudes above 3000 meters and flies to elevations as high as 6000 meters where O2 becomes limiting. In this study, its lung was morphologically- and morphometrically investigated.

We have measured the partial pressure of O2 at 50% saturation (P50) and the concentration of various phosphate compounds in the erythrocytes of the bar-headed goose and the guanaco to establish the cause of the high blood O2 affinity in animals who normally reside at high altitude.