Animal Reproduction Continued

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Author:
ash3ach
ID:
218041
Filename:
Animal Reproduction Continued
Updated:
2013-05-06 12:46:09
Tags:
Life 103
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Description:
Test 4
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  1. Ovulation expels an egg cell from the
    follicle
  2. The remaining follicular tissue grows within the ovary, forming a mass called the
    luteum
  3. The corpus luteum secretes hormones that help to maintain what?
    pregnancy
  4. If the egg is not fertilized, the corpus luteum what?
    degenerates
  5. The egg cell travels from the ovary to the uterus via an?
    oviduct or fallopian tube
  6. what in the oviduct convey the egg to the uterus, also called the womb?
    cilia
  7. the endometrium is what?
    • the uterus lining
    • has many blood vessels
  8. what happens to the uterus at the cervix?
    uterus narrows, then opens into the vagina
  9. Internal organs are the what, which produce sperm and hormones, and accessory glands
    gonads
  10. testes consist of?
    of highly coiled tubes surrounded by connective tissue
  11. seminiferous tubules
    where sperm form
  12. Leydig cells produce?
    • hormones and are scattered between the seminiferous tubules
    • Production of normal sperm cannot occur at the body temperatures of most mammals
  13. Gametogenesis
    the production of gametes by meiosis, differs in females and males
  14. spermatogenesis
    • is production of mature sperm
    • Sperm are small and motile and are produced throughout the life of a sexually mature male
  15. spermatogenesis
  16. spermatogenesis
  17. oogenesisis
    • development of mature oocytes (eggs) and can take many years
    • Eggs contain stored nutrients and are much larger
  18. oogenesis
  19. what are the three differences between spermatogenesis and oogenesis?
    • –In oogenesis, one egg forms from each cycle of meiosis; in spermatogenesis four sperm form from each cycle of meiosis
    • –Oogenesis ceases later in life in females; spermatogenesis continues throughout the adult life of males
    • –Oogenesis has long interruptions; spermatogenesis produces sperm from precursor cells in a continuous sequence
  20. Human reproduction is coordinated by hormones from what 3 things?
    hypothalamus, anterior pituitary, and gonads
  21. Gonadotropin-releasing hormone (GnRH) is secreted by the hypothalamus and directs the release of what and what from the anterior pituitary
    FSH and LH
  22. what do FSH and LH regulate?
    processes in the gonads and the production of sex hormones
  23. FSH
    promotes the activity of Sertoli cells, which nourish developing sperm and are located within the seminiferous tubules
  24. LH
    regulates Leydig cells, which secrete testosterone and other androgen hormones, which in turn promote spermatogenesis
  25. Testosterone
    regulates the production of GnRH, FSH, and LH through negative feedback mechanisms
  26. Sertoli cells secrete what hormone, which reduces what?
    inhibin which reduces FSH secretion from the anterior pituitary
  27. Prior to ovulation what happens to the endometrium?
    • endometrium thickens with blood vessels in preparation for embryo implantation
    • In females, the secretion of hormones and the reproductive events they regulate are cyclic
  28. If an embryo does not implant in the endometrium, the endometrium is shed in a process called what?
    menstruation
  29. changes in the uterus define the what?
    menstrual cycle (also called the uterine cycle)
  30. changes in the ovaries define what?
    the ovarian cycle
  31. The sequential release of GnRH then FSH and LH stimulates what?
    follicle growth

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