Fetal Circulation

Question 1

How does embryo get its needs?

Answer 1

diffusion across placenta

Question 2

Umbilical arteries

Answer 2

Deoxygenated blood to placenta from internal iliac arteries

Question 3

Umbilical Veins

Answer 3

blood returns oxygenated

Question 4

3 differences between fetal and infant circulation

Answer 4

1. blood returning in U. veins passes liver to IVC (through ductus venosus)
2. R.Atrium > L.Atrium pressure = foramen ovale allows blood to pass R.Ventricle
3. Ductus arteriosus takes blood from R.Ventricle to aorta

Question 5

Clamping of U.Cord

Answer 5

U.Vein = Changes to ligamentum teres
U.Arteries = Changes to ligaments

Question 6

First Breath

Answer 6

INC alveolar pressure = vasodilation of pulmonary vessels

Ductus arteriosus becomes LIGAMENTUM ARTERIOSUM

Ductus Venosus becomes LIGAMENTUM VENOSUM

INC L.Atrium pressure + DEC R.atrium pressure = foramen ovale closes