OB ANESTHESIA PRACTICE
QUESTIONS WITH CORRECT
ANSWERS
___ interacts with the trophoblast:
A. Decidua basalis
B. Decidua capsularis
C. Decidua parietalis - ....ANSWER ...-A. Decidua basalis
___ encapsulates the embryo on the luminal side:
A. Decidua basalis
B. Decidua capsularis
C. Decidua parietalis - ....ANSWER ...-B. Decidua capsularis
___ surrounds the uterus:
A. Decidua basalis
B. Decidua capsularis
C. Decidua parietalis - ....ANSWER ...-C. Decidua parietalis
Maternal blood flow to the placenta originates from which artery? -
....ANSWER ...-Internal Iliac Artery
....FOR STUDY PURPOSES...©️2025 ALL RIGHTS RESERVED... 1
,How much blood flow reaches the placenta at term? - ....ANSWER ...-700-900
mL/min.
Place the following in order for maternal-fetal circulation.
Internal iliac artery
Right atrium
IVC
Umbilical artery
Left atrium
Left ventricle
Patent foramen ovale
Right ventricle
Ductus arteriosus
Ductus venosus
Pulmonary artery
Aorta
Placenta - ....ANSWER ...-1. Internal iliac artery
2. Umbilical artery
3. Placenta
4. Ductus venosus
....FOR STUDY PURPOSES...©️2025 ALL RIGHTS RESERVED... 2
,5. IVC
6. Right atrium
7. PFO --> Left atrium --> Left ventricle
8. Right ventricle --> Pulmonary artery --> Ductus arteriosus
9. Aorta
The structure that diverts oxygenated blood from the right atrium to the left atrium:
A.
Foramen ovale
B.
Ductus arteriosus
C.
Ductus venous
D.
Pulmonary trunk - ....ANSWER ...-A.
Foramen ovale
The foramen ovale is a small opening between the right and left atria of the fetal heart.
During fetal development, it allows oxygenated blood to bypass the non-functioning
lungs and flow directly from the right atrium to the left atrium. This is important
because the lungs are not yet fully developed and cannot efficiently oxygenate blood.
....FOR STUDY PURPOSES...©️2025 ALL RIGHTS RESERVED... 3
, After birth, the foramen ovale typically closes as a flap of tissue seals the opening,
redirecting blood flow to the lungs for oxygenation.
The structure that diverts oxygenated blood from the pulmonary trunk to the fetal aorta:
A.
Foramen ovale
B.
Ductus ateriosus
C.
Ductus venous
D.
Pulmonary trunk - ....ANSWER ...-B.
Ductus ateriosus
The correct answer is ductus ateriosus. During fetal development, the ductus ateriosus is
a blood vessel that connects the pulmonary trunk to the aorta, bypassing the lungs. This
allows oxygenated blood to be directed away from the non-functioning fetal lungs and
towards the rest of the body. After birth, the ductus ateriosus normally closes, redirecting
blood flow to the lungs for oxygenation.
Following circulation, deoxygenated fetal blood returns to the placenta via the:
A.
Umbilical arteries
....FOR STUDY PURPOSES...©️2025 ALL RIGHTS RESERVED... 4
QUESTIONS WITH CORRECT
ANSWERS
___ interacts with the trophoblast:
A. Decidua basalis
B. Decidua capsularis
C. Decidua parietalis - ....ANSWER ...-A. Decidua basalis
___ encapsulates the embryo on the luminal side:
A. Decidua basalis
B. Decidua capsularis
C. Decidua parietalis - ....ANSWER ...-B. Decidua capsularis
___ surrounds the uterus:
A. Decidua basalis
B. Decidua capsularis
C. Decidua parietalis - ....ANSWER ...-C. Decidua parietalis
Maternal blood flow to the placenta originates from which artery? -
....ANSWER ...-Internal Iliac Artery
....FOR STUDY PURPOSES...©️2025 ALL RIGHTS RESERVED... 1
,How much blood flow reaches the placenta at term? - ....ANSWER ...-700-900
mL/min.
Place the following in order for maternal-fetal circulation.
Internal iliac artery
Right atrium
IVC
Umbilical artery
Left atrium
Left ventricle
Patent foramen ovale
Right ventricle
Ductus arteriosus
Ductus venosus
Pulmonary artery
Aorta
Placenta - ....ANSWER ...-1. Internal iliac artery
2. Umbilical artery
3. Placenta
4. Ductus venosus
....FOR STUDY PURPOSES...©️2025 ALL RIGHTS RESERVED... 2
,5. IVC
6. Right atrium
7. PFO --> Left atrium --> Left ventricle
8. Right ventricle --> Pulmonary artery --> Ductus arteriosus
9. Aorta
The structure that diverts oxygenated blood from the right atrium to the left atrium:
A.
Foramen ovale
B.
Ductus arteriosus
C.
Ductus venous
D.
Pulmonary trunk - ....ANSWER ...-A.
Foramen ovale
The foramen ovale is a small opening between the right and left atria of the fetal heart.
During fetal development, it allows oxygenated blood to bypass the non-functioning
lungs and flow directly from the right atrium to the left atrium. This is important
because the lungs are not yet fully developed and cannot efficiently oxygenate blood.
....FOR STUDY PURPOSES...©️2025 ALL RIGHTS RESERVED... 3
, After birth, the foramen ovale typically closes as a flap of tissue seals the opening,
redirecting blood flow to the lungs for oxygenation.
The structure that diverts oxygenated blood from the pulmonary trunk to the fetal aorta:
A.
Foramen ovale
B.
Ductus ateriosus
C.
Ductus venous
D.
Pulmonary trunk - ....ANSWER ...-B.
Ductus ateriosus
The correct answer is ductus ateriosus. During fetal development, the ductus ateriosus is
a blood vessel that connects the pulmonary trunk to the aorta, bypassing the lungs. This
allows oxygenated blood to be directed away from the non-functioning fetal lungs and
towards the rest of the body. After birth, the ductus ateriosus normally closes, redirecting
blood flow to the lungs for oxygenation.
Following circulation, deoxygenated fetal blood returns to the placenta via the:
A.
Umbilical arteries
....FOR STUDY PURPOSES...©️2025 ALL RIGHTS RESERVED... 4
