What strong stimulus to the infant provides the impetus for the first breath?
a. Acidosis
b. Exposure to warmth
c. Fright from passing through the birth canal
d. High PaO2
ANS: A
The newborn infant is stimulated by new tactile and thermal stimuli, all of which stimulate breathing. In addition, as placental gas transfer is suddenly interrupted, the newborn quickly be-comes hypoxemic, hypercapnic, and acidotic.
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