During prenatal class, the childbirth educator describes the two ...

[futuristic]

During prenatal class, the childbirth educator describes the two membranes that envelop the fetus. The __________ contains the amniotic fluid, and the __________ is the thick, outer membrane.
 
  Fill in the blank with the appropriate word.

Question 2

The perinatal nurse is teaching nursing students about fetal circulation and explains that fetal blood flows through the superior vena cava into the right __________ via the __________.
 
  Fill in the blank with the appropriate word.

[Pamela.irrgang@yahoo.com]

Answer to Question 1

ANS: amnion; chorion
The embryonic membranes (chorion and amnion) are early protective structures that begin to form at the time of implantation. The thick chorion, or outer membrane, forms first. It develops from the trophoblast and encloses the amnion, embryo, and yolk sac. The amnion arises from the ectoderm during early embryonic development. The amnion is a thin, protective structure that contains the amniotic fluid. With embryonic growth, the amnion expands and comes into contact with the chorion. The two fetal membranes are slightly adherent and form the amniotic sac.

Answer to Question 2

ANS: atrium; foramen ovale
Blood flows through the vein from the placenta to the fetus. Most of the blood bypasses the liver and then enters the inferior vena cava by way of the ductus venosus, a vascular channel that connects the umbilical vein to the inferior vena cava. The blood then empties into the right atrium, passes through the foramen ovale (an opening in the septum between the right and left atrium) into the left atrium, and then moves into the right ventricle and on into the aorta. From the aorta, blood travels to the head, upper extremities, and lower extremities.

[futuristic]

Correct answers!

[Pamela.irrgang@yahoo.com]

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