OB Final Exam Questions and Answers Rated A+

OB Final Exam Questions and Answers Rated A+ The total number of chromosomes contained in a mature sperm or ovum is: a. 22. b. 23. c. 44. d. 46. ANS: B Gametes (sex chromosomes) contain 23 chromosomes. A pregnant woman states, "My husband hopes I will give him a boy because we have three girls." The nurse explains that: 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. ANS: D When a Y-bearing sperm fertilizes an ovum, a male child is produced. Using a diagram, the nurse points out the most common site for fertilization, which is the: a. lower segment of the uterus. b. outer third of the fallopian tube near the ovary. c. upper portion of the uterus. d. area of the fallopian tube farthest from the ovary. ANS: B Fertilization takes place in the outer third of the fallopian tube, which is closest to the ovary. The embryo is termed a fetus at which stage of prenatal development? a. 2 weeks b. 4 weeks c. 9 weeks d. 16 weeks ANS: C The fetus (third stage of prenatal development) begins at the ninth week and continues until the 40th week of gestation or until birth. The nurse explains to a pregnant patient that blood is circulating through the placenta to the fetus by way of: a. one umbilical vein. b. two umbilical veins. c. one umbilical artery. d. two umbilical arteries. ANS: A The umbilical vein transports richly oxygenated blood from the placenta to the fetus. The nurse explains that the usual location for implantation of the zygote is the: 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. ANS: A The zygote usually implants in the upper section of the posterior uterine wall. The embryonic membrane that contains fingerlike projections on its surface, which attach to the uterine wall, is the: a. amnion. b. yolk sac. c. chorion. d. decidua basalis. ANS: C The chorion is a thick membrane with fingerlike projections (villi) on its outermost surface. The nurse explains that the hormone responsible for converting the endometrium into decidual cells for implantation is: a. estrogen. b. human chorionic gonadotropin. c. human placental lactogen. d. progesterone. ANS: D At high levels, progesterone maintains the endometrial lining for implantation of the zygote. When the patient asks when her infant's heart will begin to pump blood, the nurse replies that blood circulation begins: a. by the end of week 3. b. beginning in week 8. c. at the end of week 16. d. beginning in week 24. ANS: A The fetal heart begins to pump by week 3 of gestation. In fetal circulation, the purpose of the ductus venosus is to bypass the: a. liver. b. heart. c. lungs. d. kidneys. ANS: A Fetal blood bypasses the liver through the ductus venosus by carrying blood directly to the inferior vena cava. Untreated respiratory distress in the newborn could cause which complication? a. Esophageal