During preconception counseling, the clinic nurse explains that ...

[123654777]

During preconception counseling, the clinic nurse explains that the time period when the fetus is most vulnerable to the effects of teratogens occurs from:
 
  a. 2 to 8 weeks
  b. 4 to12 weeks
  c. 5 to 10 weeks
  d. 6 to 15 weeks

Question 2

The clinic nurse knows that the part of the endometrial cycle occurring from ovulation to just prior to menses is known as the:
 
  a. Menstrual phase
  b. Proliferative phase
  c. Secretory phase
  d. Ischemic phase

[potomatos]

Answer to Question 1

ANS: a
The period of organogenesis lasts from approximately the second until the eighth week of gestation during which time the embryo undergoes rapid growth and differentiation. During organogenesis, the embryo is extremely vulnerable to teratogens such as medications, alcohol, tobacco, caffeine, illegal drugs, radiation, heavy metals, and maternal (TORCH) infections. Structural fetal defects are most likely to occur during this period because exposure to teratogens either before or during a critical period of development of an organ can cause a malformation.

Answer to Question 2

ANS: c
Feedback
a. The menstrual phase is the time of vaginal bleeding, approximately days 1 to 6.
b. The proliferative phase ends the menses through ovulation, approximately days 7 to 14.
c. The secretory phases occurs from the time of ovulation to the period just prior to menses, or approximately days 15 to 26.
d. The ischemic phase occurs from the end of the secretory phase to the onset of menstruation, approximately days 27 to 28.