OB Final Exam:OB Final Exam Study Guide: Questions & Answers: Latest Updated

A woman who is 25 weeks pregnant asks the nurse what her fetus looks like. The nurse explains that one physical characteristic present in a 25- week-old fetus is: a. lanugo covering the body. b. constant motion. c. skin that is pink and smooth. d. eyes that are closed. (- ANS: A 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. 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 (- ANS: CDuring week 25, the alveoli begin to produce surfactant, which enables the alveoli to stay open for adequate lung oxygenation to occur. A woman missed her menstrual period 1 week ago and has come to the doctor's office for a pregnancy test. The nurse knows that the placental hormone measured in pregnancy tests is: a. progesterone. b. estrogen. c. human chorionic gonadotropin. d. human placental lactogen. (- ANS: C 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. When preparing to teach a class about prenatal development, the nurse would include information about folic acid supplementation because it is known to prevent: a. congenital heart defects. b. neural tube defects. c. mental retardation.d. premature birth (- ANS: B It is now known that folic acid supplements can prevent neural tube defects such as spina bifida. The nurse informs a class of expectant parents that the fetus is first considered viable at the age of _____ weeks. a. 14 b. 20 c. 25 d. 30 (- ANS: B By 20 weeks of gestation, the lungs have matured enough for the fetus to survive outside the uterus (age of viability).