× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
p
4
h
4
c
4
d
3
3
c
3
t
3
u
3
A
3
B
3
j
3
s
3
Home Q & A Board Biology-Related Homework Help Medicine Nursing and Clinical
New Topic  
vvll vvll
wrote...
Posts: 1062
Rep: 0 0
6 years ago
With regard to the development of the respiratory system, maternity nurses should be 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.
Read 50 times
1 Reply

Related Topics

Replies
wrote...
#1
6 years ago
ANS: C
A reduction in placental blood flow stresses the fetus, increases blood levels of corticosteroids, and accelerates lung maturity. Development of the respiratory system begins during the embryonic phase and continues into childhood. The infant's lungs are mature when the L/S ratio is 2:1, at about 35 weeks. Lung movements have been seen on ultrasound scans at 11 weeks.
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  1180 People Browsing
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Related Images
  
 472
  
 319
  
 321
Your Opinion
Previous poll results: Who will win the 2024 president election?