The _____ is/are responsible for oxygen and carbon dioxide ...

[vicky]

The _____ is/are responsible for oxygen and carbon dioxide transport from and to the maternal bloodstream.
 
  1. decidua basalis
  2. blastocyst
  3. germ layer
  4. chorionic villi

Question 2

A 41-week-pregnant multigravida presents in the labor and delivery unit after a nonstress test indicated that her fetus could be experiencing some difficulties in utero. Which diagnostic tool would yield more detailed information about the fetus?
 
  1. Ultrasound for fetal anomalies
  2. Biophysical profile
  3. Maternal serum alpha-fetoprotein screening
  4. Percutaneous umbilical blood sampling

[l.stuut]

Answer to Question 1

4
1. Incorrect. The decidua basalis is the portion of the decidua (endometrium) under the blastocyst where the villi attach.
2. Incorrect. The blastocyst is the embryonic development stage following the morula. At this stage, implantation occurs.
3. Incorrect. The germ layer is a layer of the blastocyst.
4. Correct. Chorionic villi are fingerlike projections that develop out of the trophoblast and extend into the blood-filled spaces of the endometrium. These villi obtain oxygen and nu-trients from the maternal bloodstream and dispose of carbon dioxide and waste products into the maternal blood.

Answer to Question 2

2
1. Incorrect. An ultrasound for fetal anomalies would most likely have occurred earlier in the pregnancy.
2. Correct. Real-time ultrasound permits detailed assessment of the physical and physi-ologic characteristics of the developing fetus and cataloging of normal and abnormal bio-physical responses to stimuli. The BPP is a noninvasive dynamic assessment of a fetus that is based on acute and chronic markers of fetal disease.
3. Incorrect. It is too late in the pregnancy to perform a MSAFP. Furthermore, it does not provide information related to fetal well-being.
4. Incorrect. Indications for PUBS include prenatal diagnosis or inherited blood disorders, karyotyping of malformed fetuses, detection of fetal infection, determination of the acid-base status of the fetus with IUGR, and assessment and treatment of isoimmunization and thrombocytopenia in the fetus.