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During life in utero, oxygenation of the fetus occurs through transplacental gas exchange. At birth, four factors combine to stimulate the respiratory center in the medulla, initiating respiration. Which of the following is NOT one of these essential factors?

A.Chemical (changes in blood gases such as decreased oxygen and increased carbon dioxide)B.Mechanical (compression and recoil of the chest during vaginal birth)C.Thermal (sudden drop in temperature from the intrauterine to extrauterine environment)D.Psychologic (the newborn's emotional response to the birth process)

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During life in utero, oxygenation of the fetus occurs through transplacental gas exchange. At birth, four factors combine to stimulate the respiratory center in the medulla, initiating respiration. Which of the following is NOT one of these essential factors?

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