The Reproductive System, Chapter 27 P Besaw
Sperm is produced in the __________ of the testes.
Sperm is stored in the __________.
Immature sperm are temperature sensitive
Why are the male testes located in the scrotum outside the body?
the remaining testis is able, by itself, to produce a sufficient amount of testosterone
the seminiferous tubules of the remaining testis are still active
the epididymis posterior to the remaining testis is still functional
xxxx All of the listed responses are correct
A man who has had a successful orchiectomy may still be able to have children because ______.
Meiosis reduces the chromosome number by half.
Why does meiosis involve two nuclear divisions rather than one, as in mitosis?
At what point during meiosis do homologous chromosomes pair up?
Crossover promotes increased genetic variability among gametes.
During meiosis, what does crossover promote?
Which of the following results from spermiogenesis?
Which of the following is the haploid cell produced as a result of meiosis I?
type A daughter cell or spermatogonium
Which of the following cells is returned to the basal lamina to continue the pool of dividing germ cells?
Which of the following inhibits the release of FSH from the anterior pituitary and GnRH from the hypothalamus when the sperm count is high?
androgen-binding protein (ABP)
Which of the following keeps the concentration of testosterone in the vicinity of the spermatogenic cells high to stimulate spermatogenesis?
Which hormone promotes the formation of secondary sex characteristics such as the appearance of pubic, axillary, and facial hair, enhanced hair growth on the chest, and a deepening voice?
The number of chromosomes in a human gamete is __________; this is referred to as the __________ chromosome number.
Genetic variation of individual chromosomes occurs during __________.
sperm are produced
Which of the following occurs during spermiogenesis?
Enzymes that allow sperm to penetrate the egg are located in the __________ of the sperm cell.
luteinizing hormone; testosterone
The release of __________ encourages interstitial endocrine cells to release __________.
formation of haploid spermatozoa
What is the product of spermatogenesis?
posterior pituitary gland
Which of the following organs is NOT a part of the HPG axis?
to prevent activation of the immune system of the male against the developing sperm
What is the function of the blood testis barrier?
relaxation of muscle tissue in arteries
Although effective in treating erectile dysfunction, Viagra has the side effect of reducing systemic blood pressure by causing ______.
uterine (fallopian) tube (oviduct)
What part of the female duct system is the usual site of fertilization of the ovulated oocyte?
Which structure of the female's external genitalia has erectile tissue like the penis?
stratum functionalis; stratum basalis
The __________, a layer of the endometrium, is shed during each menstruation and is then regenerated by the __________.
The mammary glands are present in both sexes.
xxxuterine tube/transport unfertilized ovum to uterus for removal from the body
uterus/the womb (area of development of the fetus)
ovarian follicle/ovum (egg) production
Which of the following is an INCORRECT matching of female reproductive structures with their functions?
stratum functionalis of the endometrium
Which layer of the uterus is the site for implantation of a fertilized egg?
decreased number of cilia in the uterine tubes
Which of the following conditions might contribute to an increased probability of having an ectopic pregnancy?
Which of the following cells is released during ovulation?
Polar bodies lack nutrient-containing cytoplasm
Why CAN'T polar bodies be fertilized?
one functional gamete
How many functional gametes are produced by oogenesis?
What event occurs during the proliferative phase?
During what phase of the female's uterine (menstrual) cycle is the uterine lining shed?
luteinizing hormone (LH)
What hormone promotes ovulation?
the follicular phase
Formation of a secondary oocyte occurs during __________.
luteinizing hormone (LH)
A surge in __________ directly triggers ovulation.
the endometrium prepares for implantation
During the secretory phase of the uterine cycle __________.
Which of the following is an effect of estrogen in females?
Female infants are born with primary oocytes that are stalled in prophase I until puberty. At the onset of puberty, the ovaries begin oogenesis. During oogenesis, three polar bodies and one functional gamete are produced. Oogenesis is achieved through meiosis. However, the ovulated secondary oocyte arrests in metaphase II and does not complete meiosis II until it is fertilized
Oocytes only complete meiosis II if they are fertilized.
Dehydroepiandrosterone (DHEA) is the main androgen that is associated with female libido.
The unequal cytoplasmic division that results in one egg and three polar bodies ensures that a fertilized egg has ample nutrients for its journey to the uterus.
Why does only one egg, rather than four eggs, develop during oogenesis, given that spermatogenesis results in four sperm formed from one stem cell?
Amenorrhea can occur in women engaged in extremely strenuous physical activity, and also occurs in women who ______.
Which of the following is NOT a sexually transmitted bacterial disease?
What determines the gender (sex) of a child?
-failure of sister chromatids to separate properly during anaphase II
-failure of homologous chromosomes to separate properly during anaphase I
-failure of centromeres to split apart properly during meiosis II
xxxAll of the listed responses are correct
Nondisjunction may occur due to ______.
a mutation in the gene that codes for the testosterone receptor
If embryonic testes do not produce testosterone, a genetic male develops female external genitalia. However, if embryonic testes properly produce testosterone, but a genetic male nevertheless develops female external genitalia, the cause could be ______.