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Author Question: Beginning at about age 11, boys develop relatively more _______________. Fill in the blank(s) ... (Read 69 times)

jwb375

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on: Jun 22, 2018
Beginning at about age 11, boys develop relatively more _______________.
 
  Fill in the blank(s) with correct word

Question 2

Describe the function and purpose of the placenta and explain what types of harmful substances can break through the placental barrier and possibly harm the fetus.
 
  What will be an ideal response?


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dominiqueenicolee

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Reply #1 on: Jun 22, 2018
Answer to Question 1

muscle

Answer to Question 2

Mother and embryo have separate circulatory systems. The pancake-shaped placenta contains a membrane that acts as a filter that permits oxygen and nutrients to reach the embryo from the mother, and permits carbon dioxide and waste products to pass to the mother from the embryo. The mother then eliminates them through her lungs and kidneys. Germs that cause syphilis and German measles and drugs like aspirin, narcotics, alcohol and tranquilizers, can cross the placenta and affect the fetus.


jwb375

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Reply 2 on: Jun 22, 2018
Thanks for the timely response, appreciate it

steff9894

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Reply 3 on: Yesterday
Wow, this really help

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