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Home Q & A Board Biology-Related Homework Help Medicine Nursing and Clinical
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anr17 anr17
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6 years ago
Concerning the development of the respiratory system, maternity nurses should be aware that:
 
  1. the respiratory system doesn't begin development until after the embryonic stage.
  2. the infant's lungs are considered mature when the L/S ratio is 1:1, at about 32 weeks.
  3. maternal hypertension can decrease maternal placental blood flow, which accele-rates lung maturity.
  4. fetal respiratory movements are not visible on ultrasound until at least 16 weeks.
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#1
6 years ago
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1. Incorrect. The respiratory system begins development during the embryonic phase and continues into childhood.
2. Incorrect. The infant's lungs are mature when the L/S ratio is 2:1, at about 35 weeks.
3. Correct. The decreased placental blood flow stresses the fetus, increases blood levels of corticosteroids, and so accelerates lung maturity.
4. Incorrect. Lung movements have been seen on ultrasound at 11 weeks.
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