Which of the following best describes the changes seen in an infant's chest wall mechanics?
a. The healthy newborn has a very rigid chest wall.
b. The ribs are completely ossified at birth.
c. The infant's ribs are elliptical in shape.
d. The chest wall is very compliant but not very stable.
ANS: D
The healthy infant is born with a very compliant chest wall because it is primarily cartilaginous at
this point, and the ribs will not begin to ossify until several months after birth. The rib cage in an
infant shows more of a horizontal alignment of the ribs than the adult elliptical shape.
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Fill in the blank(s) with correct word
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