Placenta

Question 1

When does the placenta begin to develop?

Answer 1

2nd week of development

Question 2

What day does implantation begin?

Answer 2

6

Question 3

What happens to the yolk sac and the amniotic sac?

Answer 3

Yolk sac disappears and the amniotic sac enlarges and surrounds the fetus

Question 4

What happens to the placenta membrane as the fetus grows?

Answer 4

Gradually gets thinner

Question 5

What is a chrorionic villus?

Answer 5

Projections from the chorionic membrane to increase contact with maternal blood supply

Question 6

What is the decidual reaction?

Answer 6

Between the conceptus and endometrium to prevent invasion too deep into the tissue

Question 7

What is carried in the 2 umbilical arteries?

Answer 7

Deoxygenated blood from fetus to placenta

Question 8

When is hCG produced and what by?

Answer 8

First 2 months of pregnancy by the syncytiotrophoblast

Question 9

Name some substances that can move across the placenta by simple diffusion

Answer 9

Water, electrolytes, urea and gases

Question 10

Name some substances that require active transport to move across the placenta

Answer 10

Amino acids, iron and vitamins

Question 11

What type of antibodies are passed on via the placenta?

Answer 11

IgG

Question 12

Name 3 harmful substances that can cross the placenta

Answer 12

Thalidomide, alcohol, warfarin, ACE inhibitors, anti-epileptic drugs, drugs of abuse