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