Basic Embryology

Questions from DeWitt Workbook 7

all of the above

Ultimately, the sinus venosus forms the _______.

right and left atria

The primitive atrium will divide into the _______.

fourth

Ultimately, the left _______ aortic arch forms the definitive aortic arch.

A

ductus arteriosus

B

foramen ovale

C

ductus venosus

D

umbilical veins

E

umbilical arteries

F

internal iliac arteries

G

placenta

ostium secundum

Early in development, the _______ is the only great vessel leaving the heart.

seven

By the end of week _______, the major development of the heart is complete.

placenta

In the fetus, the _______ is responsible for the exchange of oxygen, carbon dioxide, nutrients, and waste products.

ductus venosus

The majority of the blood in the umbilical vein is dumped into the _______ which connects directly to the inferior vena cava.

58%

The umbilical artery O₂ saturation is approximately _______.

right atrium, foramen ovale, left atrium, left ventricle, aorta

Choose the correct order of flow.

superior vena cava

Depleted blood returns to the heart via the _______.

patent ductus arteriosus and patent foramen ovale

While performing an echo on a premature baby, what two findings are to be expected?

increased left atrial pressure

What causes the foramen ovale to close?

ligamentum arteriosum

The remnant of the ductus arteriosus is called the _______.

pulmonary hypertension and persistent right to left shunting across the PFO and PDA

Persistent fetal circulation is the result of _______.