embryo

Question 1

What is the amnion?

Answer 1

First membrane to develop, surrounds embryo and secretes amniotic fluid

Question 2

What does amniotic fluid do?

Answer 2

Protects embryo, maintains temperature, allows free movement

Question 3

When does amnion rupture?

Answer 3

Usually just before childbirth

Question 4

What is the chorion?

Answer 4

Formed from blastocyst outer cells + mesoderm, surrounds embryo and other membranes, forms foetal part of placenta

Question 5

What are chorionic villi?

Answer 5

Finger-like projections filled with blood vessels, increasing surface area for exchange

Question 6

What is the placenta?

Answer 6

Organ that supplies nutrients, removes waste, and produces hormones

Question 7

Do maternal and foetal blood mix?

Answer 7

No, separated by cell layers

Question 8

How does exchange occur in the placenta?

Answer 8

By diffusion and active transport

Question 9

When is the placenta fully formed?

Answer 9

By the end of the third month

Question 10

What attaches foetus to placenta?

Answer 10

Umbilical cord

Question 11

What blood vessels are in the umbilical cord?

Answer 11

Two arteries (to mother), one vein (to foetus)

Question 12

How does blood enter and leave maternal side of placenta?

Answer 12

Enters via uterine arteries, leaves via uterine veins

Question 13

Summary of embryonic membranes and placenta?

Answer 13

Amnion and chorion protect and nourish embryo. Placenta enables nutrient/waste exchange and hormone production, connected by umbilical cord