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Multiple Choice Quiz
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1
Select the site where the union of a sperm cell and a secondary oocyte occurs.
A)Vagina
B)Uterus
C)Uterine tube
D)Ovary
2
________ in semen stimulate(s) wave-like contractions of the uterus and uterine tubes.
A)Prostaglandins
B)Bicarbonate ions
C)Sperm
D)Testosterone
3
Once a sperm penetrates the plasma membrane of a secondary oocyte,
A)mitotic division of the oocyte begins.
B)meiosis I of the oocyte begins.
C)meiosis II of the oocyte begins.
D)other sperm quickly follow into the oocyte.
4
Sperm and ________ nuclei unite in fertilization to form a ________, the first cell of the baby-to-be.
A)ovum; zygote
B)secondary oocyte; zygote
C)secondary oocyte; morula
D)ovum; blastocyst
5
When the blastocyst reaches the uterus, digestive enzymes secreted by the _________ enable implantation.
A)endometrium
B)trophoblast
C)inner cell mass
D)uterine tubes
6
The corpus luteum continues to secrete estrogen and progesterone in early pregnancy due to stimulation by
A)LH.
B)GnRH.
C)progesterone.
D)human chorionic gonadotropin.
7
An embryo is called a fetus when it becomes recognizably human after ________ weeks of development.
A)four
B)six
C)eight
D)twelve
8
Between the second and third month of pregnancy, the ________ takes over the role of secreting estrogen and progesterone to maintain the uterine lining.
A)ovaries
B)placenta
C)embryo
D)None of these choices.
9
The ________ provides an interface for the exchange of materials between embryonic and maternal bloods.
A)placenta
B)amnion
C)umbilical cord
D)yolk sac
10
Labor begins when the increasing concentration of ________, which stimulates uterine contractions, reaches a point that overrides the effect of progesterone, which inhibits uterine contractions.
A)relaxin
B)oxytocin
C)estrogen
D)HCG
11
Pressure of the baby’s head against the ________ stimulates an increasing level of ________ secretion, which strengthens and increases the rate of uterine contractions until birth of the baby.
A)body of the uterus; oxytocin
B)cervix; relaxin
C)placenta; estrogen
D)cervix; oxytocin
12
Most of the blood returning to the right atrium of the fetal heart
A)flows into the right ventricle.
B)passes through the foramen ovale into the left atrium.
C)passes directly through the ductus arteriosus into the aorta.
D)is pumped to the lungs.
13
Suckling by an infant forms neural impulses that maintain lactation by stimulating the
A)hypothalamus to secrete prolactin-releasing hormone.
B)anterior pituitary to secrete prolactin.
C)posterior pituitary to secrete oxytocin.
D)contraction of the milk ducts.
14
A person exhibiting a dominant trait determined by one pair of genes possesses at least ________ for that trait.
A)two recessive alleles
B)two dominant alleles
C)one dominant allele
D)None of these choices.
15
A male inherits X-linked traits from
A)only his father.
B)only his mother.
C)one or the other of his parents.
D)both his father and mother.





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