Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909



Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909
Textbook Problem

The average P co 2 in the umbilical arteries during fetal life is about

A. 25 mm Hg

B. 35 mm Hg

C. 45 mm Hg

D. 55 mm Hg

Summary Introduction


In mammals that have placenta, there is a connection or conduit that extends between the placenta and the fetus. This is known as the umbilical cord. This is a part of the fetus and contains two arteries and a vein. Since the arteries and veins carry oxygenated and deoxygenated blood, they create a certain amount of pressure, which is represented as PO2 and PCO2.


Explanation for the correct answer:

Option (d) is, ’55 mm Hg’ the pressure of carbon dioxide in the umbilical arteries of the fetus.’ There are two umbilical arteries that are wrapped around the umbilical vein and carry the deoxygenated blood from the fetus to the placenta. The pressure of carbon dioxide in the blood found in these arteries is 55 mm Hg. Hence, option (d) is the correct answer.

Explanation for the incorrect answers:

Option (a) is, ’25 mm Hg’. Neither the oxygen nor the carbon dioxide pressure in either the umbilical arteries or the umbilical vein is 25 mm Hg...

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