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Home Q & A Board Biology-Related Homework Help General Biology
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bklynbeauty86 bklynbeauty86
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6 years ago
How does exchange of nutrients, gases, and wastes occur during pregnancy if maternal and fetal blood never mix?
 
  What will be an ideal response?

Question 2

The megaspore eventually becomes a _______-celled embryo sac after many cytoplasmic divisions.
 
  a. 3
  b. 4
  c. 7
  d. 8
  e. 16
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wrote...
#1
6 years ago
Answer to q. 1

Maternal and embryonic bloodstreams never mix. The design of the placenta allows exchange to occur. Substances move between maternal and embryonic blood by diffusing across the walls of the embryonic vessels in the chorionic villi. Oxygen diffuses from maternal blood into embryonic blood, and carbon dioxide diffuses in the opposite direction. Transport proteins assist in the movement of essential nutrients from the maternal blood into embryonic blood vessels inside the villi.

Answer to q. 2

c
bklynbeauty86 Author
wrote...
#2
6 years ago
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