Bio 227 chap 27

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Bio 227 chap 27
2013-11-30 16:35:23
Chap 27
bio 227 chap 27
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  1. which of the following statements is true concerning the mammary glands of both males and females?
    The mammary glands are modified sweat glands that are actually part of the integumentary system.
  2. Normally menstruation occurs when ____.
    blood levels of estrogen and progesterone decreases
  3. The basic difference between spermatogenesis and oogenesis is that ____.
    in oogenesis, one mature ovum is produced, and in spermatogenesis four mature sperm are produced from the parent cell.
  4. Occasionally three polar bodies are found clinging to the mature ovum. Once came from an unequal division of the ovum, but from where did the other two arise?
    The first polar body has also divided to produce two polar bodies.
  5. Which of the following will occur after ovulation?
    The endometrium enters its secretory phase.
  6. Why doesnt semen enter the urinary bladdar during ejaculation?
    The smooth muscle sphincter at the base of the urinary bladder closes.
  7. Spermatogenesis _______.
    involves a kind of cell division limited to the gametes
  8. Which hormone is absolutely necessary for ovulation to occur?
  9. The hypothalamic-pituitary-gonadal axis ____.
    involves FSH and LH release.
  10. Select the correct statement about testosterone control.
    GnRH from the hypothalamus causes FSH and LH release from the anterior pituitary.
  11. Which of the following is correct statement about uterine tubes?
    The infundibulum is the funnel-shaped region near the ovary.
  12. Select the correct statement about the hormonal events of the ovarian cycle.
    High estrogen levels result in a surge of LH release
  13. Which of these statements about sexually transmitted infections is false?
    Syphilis is caused by a virus that may lead to death if untreated.
  14. Which of the following statements about spermatogenesis is not true?
    Each spermatid forms two sperm
  15. A boy who has not passed through puberty sustains an injury to his anterior pituitary such that FSH is no longer released, but LH is normal. After he grows to maturity, one would expect that he would ___.
    be unable to produce viable sperm
  16. Which of the following statements about the female reproductive process is not true?
    Rebuilding the endometrium is under the control of prolactin