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This study uses fibre-optic sensors to measure oxygen partial pressure (Po2) near, and inside of, the embryo during days 3 �5, and relates the data to total body lactate levels. The study shows that fluids surrounding the embryo greatly impede oxygen diffusion, withPo2 becoming severely hypoxic near the embryo, occasionally almost anoxic inside it. Meanwhile, lactate rises to high levels, and the stored lactate can be later oxidised by the embryo when the chorioallantois takes over and metabolism becomes entirely aerobic.

http://link.springer.com/10.1007/s00360-021-01372-y

Source: Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology - November 1, 2021 Category: Physiology Source Type: research