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Author Question: Oxygen content is highest in which of the following fetal structures? a. Ductus venosus b. ... (Read 89 times)

lak

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on: Jun 28, 2018
Oxygen content is highest in which of the following fetal structures?
 
  a. Ductus venosus
  b. Foramen ovale
  c. Umbilical artery
  d. Umbilical vein

Question 2

The foramen ovale closes after birth because of:
 
  a. Increased pressure in the left atrium
  b. High oxygen content of the blood
  c. Constriction of umbilical vessels
  d. Decreased pressure in the right ventricle


batool

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Reply #1 on: Jun 28, 2018
Answer to Question 1

ANS: D
Because oxygenated blood from the mother passes through the placenta to the fetus through the umbilical vein, blood in the umbilical vein has the highest oxygen content of the listed structures.

Answer to Question 2

ANS: A
The increase in pulmonary blood flow after birth causes the pressure in the left atrium to exceed that of the right atrium. This functionally closes the foramen ovale. Permanent closure occurs as adhesions develop.


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lak

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Reply #2 on: Jun 28, 2018
Thank you


batool

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Reply #3 on: Jun 28, 2018
No problemo


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