Structures in the developing embryo

Question 1

Extra embryonic membranes are needed for (4)
PREN

Answer 1

• protection
  -respiration
  -excretion of embryo
  -nutrition

Question 2

Amnion
-what is it
-filled with what
-function

Answer 2

-sac connected to umbillical cord
-fluid
-protects embryo from trauma and temp

Question 3

Yolk sac
-function

Answer 3

digestive tract and makes the first blood cells and reporductive cells

Question 4

Allantois
-forms foundation of what
-remainder becomes what

Answer 4

-umbilical cord, later goes away
-part of bladder

Question 5

Chorion
-which membrane
-function

Answer 5

-outermost
-forms the fetal portion of placenta

Question 6

Placenta
-during which week of pregnancy is it established, and how is it
-what is it rich in
-what does it attach the embryo to

2 parts of the placenta and what does it supply

Answer 6

-2nd, choronic villi make it
-blood vessles
-uterine wall

1. embryonic/fetal portion: chorion tissue from embryo
2. Meternal portion: blood from mother

Question 7

Are blood systems of mom and baby seperate or together?
-what does that permit
-how do nutrients and oxygen enter baby
-how does waste leave baby
-does the placenta filter out drugs/diseases

Answer 7

-seperate but very close
-exchange of nutrients and waste
-diffusion from moms circulatory into baby
-from babys circulation and into moms circulatory system for excretion

no

Question 8

Umbillical cord
-forms during which week
-leads from where to where
-contains (3)

Answer 8

-end of 8th
-naval portion of fetus to center of placenta
-2 arteries and 1 vein