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Exercise 32 Fetal Circulation
Terms in this set (30)
In a developing fetus, the _____ and _____ are not yet functional.
In a developing fetus, all the nutrients, excretory and gaseous exchanges occur through the _____.
Nutrients and oxygen move across placental barriers from the _____ to the _____.
From the mother's blood to the fetal blood
Carbon dioxide and other metabolic wastes move from the _____ to the _____.
From the fetal blood supply to the mother's blood
Fetal blood travels through the _____.
The umbilical cord contains 3 blood vessels _____.
One large umbilical vein
Two smaller umbilical arteries
The umbilical vein carries blood _____.
Rich in nutrients and oxygen to the fetus
The umbilical arteries carries blood _____.
Laden with carbon dioxide and waste from the fetus to the placenta
The umbilical arteries carry the blood away from the fetal heart and meets the umbilical vein at the _____ and wrap around the vein within the cord en route to their placental attachments.
Newly oxygenated blood flows in the _____ towards the _____.
Flows in the umbilical vein superiorly toward the fetal heart
Some of this blood perfuses the _____.
The larger proportion of blood is ducted through the relatively nonfunctional liver to the _____ via a shunt vessel called the _____.
To the inferior vena cava
Shunt vessel called the ductus venosus
The ductus venosus carries the blood to the _____.
Right atrium of the heart
Because fetal lungs are _____, two shunting mechanisms ensure that blood almost entirely bypasses the lungs.
Nonfunctional and collapsed
Much of the blood entering the right atrium is shunted into the left atrium through the _____.
A flaplike opening in the intertribal septum
The left ventricle pimps the blood out the aorta and to the _____.
Blood that does enter the right ventricle and is pumped out of the pulmonary trunk encounters a second shunt, the _____.
A short vessel connecting the pulmonary trunk and the aorta
Because the collapsed lungs present an extremely high-resistance pathway, blood more readily enters the _____ through the ductus arteriosus.
The aorta carries the blood to the _____.
Tissues of the body
The blood ultimately finds its way back to the placenta via the _____.
The only fetal vessel that carries highly oxygenated blood is the _____.
All other vessels contain varying degrees of _____.
Oxygenated and deoxygenated blood
At birth or shortly after, the foramen ovale closes and becomes the _____.
At birth or shortly after, the ductus arteriosus collapses and is converted to the _____.
Fibrous ligament arteriosum
Lack of blood flow through the umbilical vessels leads to their _____.
Eventual obliteration and the circulatory pattern becomes that of the adult
Remnants of the umbilical arteries persist as the _____ on the inner surface of the anterior abdominal wall.
Medial umbilical ligaments
The occluded umbilical vein becomes the _____.
Ligamentum theres (or round ligament of the liver)
The ductus venosus becomes a fibrous band called the _____ on the inferior surface of the liver.
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