Nokea
At what point in prenatal development do the lungs begin to produce surfactant?
- A. 17 weeks
- B. 20 weeks
- C. 25 weeks
- D. 30 weeks
Correct Answer: C
Rationale: During week 25, the alveoli begin to produce surfactant, which enables the alveoli to stay open for adequate lung oxygenation to occur.
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When preparing to teach a class about prenatal development, the nurse would include information about folic acid supplementation. What is folic acid known to prevent?
- A. Congenital heart defects
- B. Neural tube defects
- C. Mental retardation
- D. Premature birth
Correct Answer: B
Rationale: It is now known that folic acid supplements can prevent neural tube defects such as spina bifida.
What part of the fetal body derives from the mesoderm?
- A. Nails
- B. Oil glands
- C. Muscles
- D. Lining of the bladder
Correct Answer: C
Rationale: The mesoderm is responsible for the development of muscles. Nails and oil glands derive from the ectoderm. The lining of the bladder derives from the endoderm.
A pregnant woman states, 'My husband hopes I will give him a boy because we have three girls.' What will the nurse explain to this woman?
- A. The sex chromosome of the fertilized ovum determines the gender of the child.
- B. When the sperm and ovum are united, there is a 75% chance the child will be a girl.
- C. When the pH of the female reproductive tract is acidic, the child will be a girl.
- D. If a sperm carrying a Y chromosome fertilizes an ovum, then a boy is produced.
Correct Answer: D
Rationale: When a Y-bearing sperm fertilizes an ovum, a male child is produced.
A woman missed her menstrual period 1 week ago and has come to the doctor's office for a pregnancy test. Which placental hormone is measured in pregnancy tests?
- A. Progesterone
- B. Estrogen
- C. Human chorionic gonadotropin
- D. Human placental lactogen
Correct Answer: C
Rationale: Human chorionic gonadotropin is the basis for most pregnancy tests. It is detectable in maternal blood as soon as implantation occurs, usually 7 to 9 days after fertilization.
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.