Gestation and Embryonic Layers

Question 1

Embryonic Layers : Chorion

Answer 1

Outermost membrane, grows chorionic villi for attachment and nutrient exchange.

Question 2

Embryonic layers : Placenta

Answer 2

Temporary organ, diffuses oxygen and nutrients, removes waste, secretes progesterone.

Question 3

Embryonic Layers : Amnion

Answer 3

Surrounds fetus, secretes amniotic fluid for protection and support.

Question 4

Embryonic Layers : Umbilical Cord

Answer 4

Connects fetus to placenta, contains umbilical vein (oxygen/nutrient) and umbilical artery (deoxygenated/waste).

Question 5

Functions of Chorion

Answer 5

• Outer membrane with chorionic villi.
  
  • Attaches to endometrium.
  • Villi provide large surface area for nutrient exchange.
  • Villi grow into placenta.

Question 6

Functions of Placenta

Answer 6

• Temporary organ, vital during pregnancy.
  
  • Diffuses oxygen, nutrients, removes fetal waste.
  • Secretes progesterone to maintain pregnancy.
  • Acts as a barrier and protection against viruses.

Question 7

Functions of Amnion

Answer 7

• Surrounds fetus, secretes amniotic fluid.
  
  • Fluid provides cushioning, support, and protection.
  • Acts as a buffer against temperature changes.
  • Prevents mechanical injury to the fetus.

Question 8

Functions of Umbilical Cord

Answer 8

• Connects fetus to placenta.
  
  • Contains umbilical vein (oxygen/nutrient transport to fetus).
  • Contains umbilical artery (deoxygenated/waste transport away from fetus).

Question 9

Umbilical Cord Blood Vessels : Umbilical Vein

Answer 9

Carries oxygenated blood and nutrients to fetus.

Question 10

Umbilical Cord Blood Vessels : Umbilical Artery

Answer 10

Carries deoxygenated blood and waste away from fetus.