Final answer:
In labor, the fetus undergoes adaptations leading to an increase in oxygen concentration crucial for the newborn's first breath and circulatory changes.
Explanation:
An increase in oxygen concentration is the adaptation that a nurse expects to find in the fetus during labor. Labor contractions reduce oxygenated blood flow, elevating carbon dioxide levels, leading to acidosis, and stimulating the respiratory center in the brain, prompting the newborn to take its first breath.
During these initial breaths, the circulatory system changes are triggered, closing shunts that directed oxygenated blood away from the lungs, restructuring the neonatal circulation.
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