Which of the following is incorrect?
The respiratory and nervous systems are not functional at 28 weeks
External genitalia are recognizable at 12 weeks
Vascularization is visible at 12 weeks
Rounded skull contours at 11 weeks
none of the above
The time period for most elevated birth defect risk is between the 3rd and 8th weeks of gestation known as the embryonic period. The most common type of birth defect is from unknown causes
Both true
First true, second false
First false, second true
Both false
Which of the following is untrue about prenatal diagnoses?
Ultrasonography uses high-frequency sound waves to assess growth and development and may be done transabdominally or transvaginally
Maternal serum screening measures AFP which is produced in the fetal liver with production increasing until 30 weeks of gestation at which point production will decline.
Amniocentesis is done transabdominally and also measures AFP and can result in cells collected for karyotyping.
Chorionic villus sampling can be used to assess neural tube defects, genetic disorders, and chromosomal anomalies.
None, these are all good
Which of the following is correct?
Elevated AFP seen in neural tube defects
Trisomy 18 manifests as reduced AFP, uE3, and hGC
Down syndrome manifests as reduced AFP, uE3, and hGC, and inhibinA
neural tube and trisomy 18
all of the above
Disruptions are morphological alterations of already formed structures
Deformations result from mechanical forces that mold a part of the fetus
A syndrome is a group of anomalies occurring together that have a common cause
Deformations may be reversible
Nah mate, it's all good.
The placenta's fetal component is derived from the trophoblast and extraembryonic endoderm. The maternal component comes from uterine endometrium.
