With Regard to the Development of the Respiratory System,maternity Nurses

With regard to the development of the respiratory system,maternity nurses should be aware that:

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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