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False
,Normally menstruation occurs when ________.
A) blood levels of FSH fall off
B) blood levels of estrogen and progesterone decrease
C) blood levels of estrogen and progesterone increase
D) the corpus luteum secretes estrogen
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B) blood levels of estrogen and progesterone decrease
What are some risk factors for developing breast cancer?
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1) early onset of menses and late menopause; (2) first pregnancy late in life or
no pregnancies at all; (3) familial history of breast cancer; (4) post
menopausal hormone replacement.
What is the physiological importance of the fact that the male testes descend to reside in
the scrotal sac?
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, The male testes descend into the scrotal sac so that a fairly constant
intrascrotal temperature is maintained. Failure of the testes to descend results
in sterility, because production of viable spermatozoa requires a temperature
several degrees lower than normal body temperature.
The primary function of the uterus is to ________.
A) protect the ovaries
B) synthesize female hormones
C) regulate the ovarian and menstrual cycles
D) receive, retain, and nourish a fertilized ovum
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D) receive, retain, and nourish a fertilized ovum
Characteristics of the mature sperm include ________.
A) the presence of two X chromosomes in approximately half the sperm
B) the presence of Y chromosomes in approximately half the sperm
C) the absence of an acrosome
D) the absence of coiled mitochondria
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B) the presence of Y chromosomes in approximately half the sperm