Nokea
Where is the usual location for implantation of the zygote?
- A. Upper section of the posterior uterine wall
- B. Lower portion of the uterus near the cervical os
- C. Inner third of the fallopian tube near the uterus
- D. Lateral aspect of the uterine wall
Correct Answer: A
Rationale: The zygote usually implants in the upper section of the posterior uterine wall.
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What is the embryonic membrane that contains fingerlike projections on its surface, which attach to the uterine wall?
- A. Amnion
- B. Yolk sac
- C. Chorion
- D. Decidua basalis
Correct Answer: C
Rationale: The chorion is a thick membrane with fingerlike projections (villi) on its outermost surface.
The nurse is educating a class of expectant parents about fetal development. What is considered fetal age of viability?
- A. 14 weeks
- B. 20 weeks
- C. 25 weeks
- D. 30 weeks
Correct Answer: B
Rationale: By 20 weeks of gestation, the lungs have matured enough for the fetus to survive outside the uterus (age of viability).
A woman who is 25 weeks pregnant asks the nurse what her fetus looks like. What does the nurse explain is one physical characteristic present in a 25-week-old fetus?
- A. Lanugo covering the body
- B. Constant motion
- C. Skin that is pink and smooth
- D. Eyes that are closed
Correct Answer: A
Rationale: By 25 weeks, the body of the fetus is covered with lanugo, the eyes are open, the skin is wrinkled, and the fetus has definite periods of movement and sleeping.
A nurse is teaching a lesson on fetal development to a class of high school students and explains the primary germ layers. What are the germ layers? (Select all that apply.)
- A. Ectoderm
- B. Endoderm
- C. Mesoderm
- D. Plastoderm
- E. Blastoderm
Correct Answer: A,B,C
Rationale: The zygote transforms its embryonic disc into three layers: the ectoderm, the mesoderm, and the endoderm.
The embryo is termed a fetus at which stage of prenatal development?
- A. 2 weeks
- B. 4 weeks
- C. 9 weeks
- D. 16 weeks
Correct Answer: C
Rationale: The fetus (third stage of prenatal development) begins at the ninth week and continues until the 40th week of gestation or until birth.