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When it is cold the _____ contracts and draws the testes closer to the body to keep them warm
The countercurrent heat exchanger that prevents arterial blood from overheating the testes is
the pampiniform plexus of veins
Which of the following hormones directly stimulates the development of male secondary sex characteristics
____ stimulates the interstitial cells of the testes to secrete _____
Luteinizing Hormone(LH); testerone
As a result of spermatogenesis and spermiogenesis, the final cells produced are called _____ but they and all the stages leading up to them can be called _______
gametes; germ cells
At the end of meiosis I there are ______, whereas at the end of meiosis II there are
two haploid cells; four haploid cells
The most important role of meiosis in sexual reproduction is
that it prevents the chromosome number from doubling in each generation
Sperm cells get energy to power their movement from _____ contributed by the ______
A sperm count lower than _____ million sperm per mL of semen is usually associated with infertility (sterility)
20 to 25
The _____ arteries rhythmically constrict and dilate causing the uterine mucosa to blanch and flush with blood
After puberty the vaginal lining becomes ______ to ______
stratified squamous epithelium; resist abrasion
The midlife change in estrogen and progesteron is called_____ whereas the cessation of menstruation is called______
Most ovulation homee test kits measure _____ surge, which happens about 24 hours before ovulation
After expelling the oocyte, the follicle becomes the _____ and secretes______
corpus luteum; estrogen and progesterone
During the follicular phase, granulosa cells secrete _____ which stimulates the secretion of ______
______ inhibits the secretion of ______ during the female sexual cycle.
Estradiol and progesterone; FSH and LH
The basis of pregnancy test kits is the presence of ______ which is secreted by ______
human chorionic gonadotropin (HCG); blastocyst and placenta
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