5.A 23-year-old woman with a natural menstrual cycle is nearing ovula-
tion. The oocyte of a mature follicle will be induced to undergo the first
meiotic division as a result of which of the following hormonal stimuli?
a. The cessation of progesterone secretion
b. The gradual elevation of follicle-stimulating hormone (FSH) titers
c. The low estrogen titers associated with the maturing follicle
d. The slow elevation of progesterone produced by luteal cells
e. The surge of luteinizing hormone (LH) initiated by high estrogen titers
6.A couple is trying to conceive a child. Following intercourse, which of
the following is responsible for the prevention of polyspermy?
a. Resumption of the first meiotic division
b. Resumption of the second meiotic division
c. Capacitation
d. The zona reaction
e. The release of enzymes from the sperm acrosome
7.Oogonia reach their maximum number at which of the following stages
of human development?
a. Five months of fetal life
b. Birth
c. Puberty (12 to 14 years of age)
d. Adolescence (16 to 20 years of age)
e. Early adulthood (21 to 26 years of age)
8.A 26-year-old man contracted viral influenza with an unremitting fever
of 39.5°C (103°F) for 3 days. Because spermatogenesis cannot occur above
a scrotal temperature of 35.5°C (96°F), he was left with no viable sperm
after his recovery. Approximately how much time is required for the return
of viable sperm to the epididymis?
a. 3 days
b. 1 week
c. 5 weeks
d. 2 months
e. 4 months
Embryology: Early and General 73