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

With regard to the development of the respiratory system,maternity nurses should understand 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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