Which Should the Nurse Be Aware of with Regard to the Development

question 28

Multiple Choice

Which should the nurse be aware of with regard to the development of the respiratory system?

• A) The respiratory system does not begin developing until after the embryonic stage.
• B) The infant's lungs are considered mature when the lecithin/sphingomyelin (L/S)ratio is 1:1,at about 32 weeks.
• C) Maternal hypertension can reduce maternal-placental blood flow,accelerating lung maturity.
• D) Fetal respiratory movements are not visible on ultrasound scans until at least 16 weeks.

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