front 1 1) Cells on the dorsal surface of the twolayered | back 1 D) primitive streak |
front 2 2) The result of polyspermy in humans is ________. | back 2 B) a nonfunctional zygote |
front 3 3) It is impossible for sperm to be functional (able to fertilize the egg) until after ________. | back 3 C) they undergo capacitation |
front 4 4) Milk ejection or letdown reflex is stimulated by which of the
following hormones | back 4 B) oxytocin |
front 5 5) Estrogen and progesterone maintain the integrity of the uterine
lining and prepare the | back 5 C) corpus luteum |
front 6 6) The placenta, a vitally important metabolic organ, is made up of a
contribution from | back 6 A) chorion |
front 7 7) Relaxin is a hormone produced by the placenta and ovaries. The
function of this hormone | back 7 C) relax the pubic symphysis |
front 8 8) Proteases and acrosin are enzymes. How do they function in reproduction? | back 8 C) They act to break down the protective barriers around the egg,
allowing the sperm to |
front 9 9) Which of the following is not a germ layer? | back 9 C) epiderm |
front 10 10) The formation of endodermal and ectodermal germ layers occurs at ________. | back 10 C) gastrulation |
front 11 11) Which hormone maintains the viability of the corpus luteum? | back 11 C) human chorionic gonadotropin |
front 12 12) Which of the following is a highly unlikely method of producing a child? | back 12 B) ectopic implantation |
front 13 13) Which of the following is not a correct matching of a fetal
structure with what it | back 13 B) ductus arteriosus |
front 14 14) Implantation involves ________. | back 14 D) embedding of the blastocyst in the uterine wall |
front 15 15) The umbilical arteries carry ________. | back 15 A) waste products to the placenta |
front 16 16) The correct sequence of preembryonic structures is ________. | back 16 C) blastocyst, morula, zygote |
front 17 17) Which of the following is not assessed as part of the Apgar score? | back 17 D) temperature |
front 18 17) Which of the following is not assessed as part of the Apgar score? | back 18 D) temperature |
front 19 18) Hormones concerned with events of lactation include ________. | back 19 B) oxytocin |
front 20 19) Initially, the implanted embryo obtains its nutrition by ________. | back 20 D) digestion of endometrial cells |
front 21 20) Onset of labor may be a result of all of the following factors except ________. | back 21 C) aspirin and similar drugs |
front 22 21) Select the correct statement about fertilization. | back 22 B) Millions of sperm cells are destroyed by the vagina's acidic environment. |
front 23 22) Shortly after implantation ________. | back 23 C) the trophoblast forms two distinct layers |
front 24 23) The dorsal surface cells of the inner cell mass form ________. | back 24 C) the primitive streak |
front 25 26) The trophoblast is mostly responsible for forming the ________. | back 25 C) placental tissue |
front 26 27) The cardiovascular system of a newborn must be adjusted after the
infant takes its first | back 26 D) The ductus arteriosus constricts and is converted to the ligamentum arteriosum. |
front 27 28) Sperm move to the uterine tube through uterine contractions and
the energy of their | back 27 B) reverse peristalsis of the uterus and uterine tubes |
front 28 29) At which stage of labor is the "afterbirth" expelled? | back 28 C) placental |
front 29 30) Which hormone is not produced by the placenta? | back 29 D) inhibin |
front 30 31) During which stage of labor is the fetus delivered? | back 30 B) expulsion stage |
front 31 32) Implantation of the blastocyst is the result of all of the following except ________. | back 31 A) phagocytosis by the trophoblast cells |
front 32 33) Cleavage as part of embryonic development is distinctive because it involves ________. | back 32 A) cell division by mitosis with little or no growth between successive divisions |
front 33 34) Which of the following is true in reference to what may pass
through the placental | back 33 C) nutrients, respiratory gases, wastes, and alcohol |
front 34 35) Which of the following is not usually considered a teratogen? | back 34 A) aspirin |
front 35 36) Derivatives of the ectoderm include ________. | back 35 C) epithelium of the pineal and pituitary glands |
front 36 37) Derivatives of the mesoderm include ________. | back 36 B) endothelium of blood and lymph vessels |
front 37 38) Derivatives of the endoderm include ________. | back 37 A) epithelium of the respiratory tract |
front 38 39) Developmental events during weeks 912 | back 38 A) sex readily detected from the genitals |
front 39 40) Which of the choices below occurs if fertilization of the ovum
occurs and implantation | back 39 A) The corpus luteum is maintained until the placenta takes over its hormoneproducing |
front 40 41) Select the correct statement about the special fetal blood vessels. | back 40 C) The umbilical vein becomes the ligamentum teres. |
front 41 42) Which of the following statements about the events of fertilization is not true? | back 41 A) The two pronuclei divide. |
front 42 43) The decidua basalis is ________. | back 42 B) located between the developing embryo and the myometrium |