Female Reproductive System and Ovarian Cycle
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Questions and Answers

What is the primary function of the fimbriae in the oviducts?

  • To produce estrogen and progesterone
  • To implant the embryo in the uterine lining
  • To propel the egg slowly through the oviduct
  • To sweep over the ovaries and guide the egg into the oviduct (correct)
  • What is the typical location of the uterus in relation to the urinary bladder?

  • Above and tipped over the urinary bladder (correct)
  • Below and behind the urinary bladder
  • To the side of the urinary bladder
  • In front of the urinary bladder
  • What is the usual width of the uterus in its usual state?

  • 2 cm
  • 5 cm (correct)
  • 10 cm
  • 15 cm
  • Where does implantation of the embryo usually occur?

    <p>In the uterus</p> Signup and view all the answers

    What is the function of the cilia that line the oviducts?

    <p>To propel the egg slowly through the oviduct</p> Signup and view all the answers

    What is the name of the structure that contains the opening to the uterus?

    <p>Cervix</p> Signup and view all the answers

    What is the function of the ovaries in the female reproductive system?

    <p>To produce eggs and female sex hormones</p> Signup and view all the answers

    What is the purpose of the muscular walls of the uterus?

    <p>To support the development of the embryo and fetus</p> Signup and view all the answers

    What is the main function of the endometrium during embryonic and fetal development?

    <p>To supply nutrients needed for embryonic and fetal development</p> Signup and view all the answers

    What is the purpose of the functional layer of the endometrium?

    <p>To be shed during each menstrual period</p> Signup and view all the answers

    What is the angle at which the vagina lies to the small of the back?

    <p>45°</p> Signup and view all the answers

    What is the purpose of the acidic environment in the vagina?

    <p>To protect against the possible growth of pathogenic bacteria</p> Signup and view all the answers

    How many eggs does a female produce on average per month during her reproductive years?

    <p>1</p> Signup and view all the answers

    What is the purpose of the follicular fluid in a secondary follicle?

    <p>To bathe the oocyte</p> Signup and view all the answers

    What is the result of meiosis I in a primary oocyte?

    <p>Two haploid cells with 23 chromosomes each</p> Signup and view all the answers

    What is the name of the cell that results from meiosis I in a primary oocyte?

    <p>Polar body</p> Signup and view all the answers

    What triggers ovulation at around day 14 of a 28-day cycle?

    <p>LH surge</p> Signup and view all the answers

    What is the main function of estrogen in females?

    <p>Secondary sex characteristics and fat distribution</p> Signup and view all the answers

    During which phase of the ovarian cycle does the corpus luteum develop?

    <p>Luteal phase</p> Signup and view all the answers

    What is the primary function of progesterone during the uterine cycle?

    <p>Preparing the endometrium for implantation</p> Signup and view all the answers

    What is the approximate age range during which menopause typically occurs?

    <p>45-55 years</p> Signup and view all the answers

    What is the hormone responsible for milk letdown during nursing?

    <p>Oxytocin</p> Signup and view all the answers

    What is the duration of menstruation cessation required to confirm menopause?

    <p>6 months to 1 year</p> Signup and view all the answers

    What occurs to the endometrium during days 1-5 of a 28-day uterine cycle?

    <p>It disintegrates and its blood vessels rupture</p> Signup and view all the answers

    What is the primary function of a polar body?

    <p>To hold discarded chromosomes</p> Signup and view all the answers

    What happens to the endometrium during the proliferative phase of the uterine cycle?

    <p>It thickens and becomes vascular and glandular</p> Signup and view all the answers

    What triggers the secondary oocyte to undergo meiosis II?

    <p>Fertilization by a sperm cell</p> Signup and view all the answers

    What is the primary function of the corpus luteum during the uterine cycle?

    <p>To produce progesterone and cause the endometrium to prepare for implantation</p> Signup and view all the answers

    What is the typical thickness of the endometrium at the end of the secretory phase?

    <p>2–3 mm</p> Signup and view all the answers

    What happens to the corpus luteum if the egg is not fertilized?

    <p>It disintegrates</p> Signup and view all the answers

    Which hormone from the hypothalamus controls the ovaries' sexual function?

    <p>GnRH</p> Signup and view all the answers

    What happens to the corpus luteum if implantation does not occur?

    <p>It regresses, leading to a decrease in progesterone levels</p> Signup and view all the answers

    What is the primary hormonal signal that triggers ovulation?

    <p>Luteinizing hormone</p> Signup and view all the answers

    What happens to the estrogen level in the blood during the follicular phase?

    <p>It increases</p> Signup and view all the answers

    What is the result of the estrogen spike at the end of the follicular phase?

    <p>Positive feedback effect on the hypothalamus and pituitary gland</p> Signup and view all the answers

    During which days of the uterine cycle does the endometrium prepare to receive the developing embryo?

    <p>Days 15–28</p> Signup and view all the answers

    What happens to the anterior pituitary secretion of FSH as the estrogen level in the blood rises?

    <p>It decreases</p> Signup and view all the answers

    Which of the following structures develops from a vesicular follicle after it has lost the oocyte?

    <p>Corpus luteum</p> Signup and view all the answers

    Study Notes

    Female Reproductive System

    • The female reproductive system is divided into internal reproductive organs and external genital organs.

    Internal Reproductive Organs

    • Ovaries:
      • Produce eggs (ova) and female sex hormones estrogen and progesterone
      • Lie in shallow depressions on each side of the upper pelvic cavity
    • Oviducts (Uterine or Fallopian Tubes):
      • Conduct eggs
      • Location of fertilization
      • Extend projections called fimbriae that sweep over the ovaries
    • Uterus (Womb):
      • Houses developing fetus
      • Thick-walled, muscular organ about the size and shape of an inverted pear
    • Cervix:
      • Contains opening to uterus
    • Vagina:
      • Serves as birth canal and exit for menstrual flow
      • Tube that lies at a 45° angle to the small of the back
      • Mucosal lining lies in folds and can extend

    Ovarian Cycle

    • An ovary contains many follicles, each containing an immature egg called an oocyte
    • A female is born with 2 million follicles, but the number is reduced to 300,000 to 400,000 by the time of puberty
    • Only a small number of follicles (about 400) ever mature because a female usually produces only one egg per month during her reproductive years
    • The ovarian cycle consists of three stages:
      • Primary follicle stage
      • Secondary follicle stage
      • Vesicular (Graafian) follicle stage
    • Ovulation:
      • The vesicular follicle bursts, releasing the oocyte (egg) surrounded by a clear membrane
      • Occurs around day 14 of a 28-day cycle

    Oogenesis

    • Primary oocyte undergoes meiosis I, resulting in haploid cells with 23 chromosomes each
    • One of these cells is called a polar body, which is a sort of cellular "trash can"
    • Secondary oocyte undergoes meiosis II, but only if it is first fertilized by a sperm cell
    • If the secondary oocyte remains unfertilized, it will die shortly after being released from the ovary

    Estrogen and Progesterone

    • Estrogen:
      • Produced by primary and secondary follicles
      • Responsible for secondary sex characteristics in females, such as axillary and pubic hair during puberty and fat distribution
      • Affects breast development
    • Progesterone:
      • Produced by the corpus luteum
      • Preparates the uterus to receive a fertilized egg
      • Affects breast development

    Uterine Cycle

    • The uterine cycle is a cyclical series of events caused by the female sex hormones estrogen and progesterone
    • 28-day cycle consists of:
      • Days 1-5: Low estrogen and progesterone levels cause the endometrium to disintegrate and its blood vessels to rupture
      • Days 6-13: Increased estrogen production causes the endometrium to thicken and become vascular and glandular (proliferative phase)
      • Days 14-28: Increased progesterone production causes the endometrium to double or triple in thickness and prepare for implantation (secretory phase)

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    Description

    Learn about the structures and functions of the female reproductive system, the stages of the ovarian cycle, and the role of estrogen and progesterone in the reproductive process.

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