Male Reproductive System Quiz
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Questions and Answers

What is the primary function of interstitial cells in the testes?

  • To regulate sperm production
  • To support spermatogenic cells
  • To produce sperm
  • To produce testosterone (correct)

    • What is the process by which sperm is produced in the male reproductive system?

  • Meiosis
  • Hormone Regulation
  • Spermatogenesis (correct)
  • Mitosis

    • Which hormone controls the production of sperm in the male reproductive system?

  • Follicle-stimulating hormone (FSH)
  • Luteinizing hormone (LH)
  • Testosterone
  • All of the above (correct)

    • What is the function of the supporting cells in the seminiferous tubules?

    <p>To support and nourish spermatogenic cells</p> Signup and view all the answers

    What is the result of the division of a spermatogonium by mitosis?

    <p>Two cells with 46 chromosomes each</p> Signup and view all the answers

    What is the resulting number of chromosomes in the daughter cells after meiosis?

    <p>23 chromosomes</p> Signup and view all the answers

    During which stage of spermatogenesis does the chromosome number decrease?

    <p>Meiosis I</p> Signup and view all the answers

    What is the function of the acrosome in sperm anatomy?

    <p>To contain enzymes that help the sperm penetrate a secondary oocyte</p> Signup and view all the answers

    What is the outcome of crossover during meiosis I?

    <p>Chromosomes with genes from both parents</p> Signup and view all the answers

    How many sperm are formed from a primary spermatocyte?

    <p>4</p> Signup and view all the answers

    What is the primary effect of testosterone on the development of male secondary sex characteristics?

    <p>All of the above</p> Signup and view all the answers

    What is the role of the anterior lobe of the pituitary gland in the hormonal control of reproduction in males?

    <p>To release luteinizing hormone and follicle-stimulating hormone</p> Signup and view all the answers

    At what age does testosterone production typically start to decline in males?

    <p>40 years</p> Signup and view all the answers

    What is the mechanism by which male sex hormone secretion is regulated?

    <p>Negative-feedback mechanism</p> Signup and view all the answers

    What is the role of follicle-stimulating hormone in the seminiferous tubules?

    <p>To work with testosterone in stimulating spermatogenesis</p> Signup and view all the answers

    What is the primary function of the gonads in the reproductive system?

    <p>To form gametes (sex cells)</p> Signup and view all the answers

    Which of the following birth control methods works by preventing ovulation?

    <p>Hormonal pills</p> Signup and view all the answers

    What is the primary hormone responsible for regulating the male reproductive system?

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

    What is a common disorder of the reproductive system characterized by a hormonal imbalance?

    <p>Polycystic ovary syndrome (PCOS)</p> Signup and view all the answers

    During which phase of gamete formation does meiosis occur?

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

    What is the outcome of decreased GnRH production in the male reproductive system?

    <p>Decreased sperm production</p> Signup and view all the answers

    How does inhibin regulate sperm production in the male reproductive system?

    <p>By decreasing FSH secretion when sperm count is high</p> Signup and view all the answers

    What is the effect of high testosterone levels on GnRH production in the male reproductive system?

    <p>Inhibition of GnRH production</p> Signup and view all the answers

    What is the outcome of increased LH secretion in the male reproductive system?

    <p>Increased testosterone production</p> Signup and view all the answers

    What is the role of testosterone in the male reproductive system?

    <p>Maintenance of male reproductive organs and spermatogenesis</p> Signup and view all the answers

    Where does the sperm maturation and storage occur in the male reproductive system?

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

    What is the role of peristalsis in the ductus deferens?

    <p>To move sperm</p> Signup and view all the answers

    What is the function of the urethra in the male reproductive system?

    <p>To transport urine and semen</p> Signup and view all the answers

    What happens to sperm stored in the epididymis for more than two months?

    <p>They are destroyed and absorbed</p> Signup and view all the answers

    Which part of the sperm cell contains mitochondria?

    <p>Middle piece</p> Signup and view all the answers

    What is the primary function of the cremaster muscle in the scrotum?

    <p>To regulate the temperature of the testes</p> Signup and view all the answers

    What is the role of prostaglandins from seminal vesicles in the female reproductive tract?

    <p>To accelerate the movement of sperm</p> Signup and view all the answers

    What is the significance of the testes migrating into the scrotum during fetal development?

    <p>It allows for the production of viable sperm</p> Signup and view all the answers

    What is the function of the dartos muscle in the scrotum?

    <p>To smooth out the skin of the scrotum</p> Signup and view all the answers

    What is the composition of the penis?

    <p>Spongy erectile tissue</p> Signup and view all the answers

    What is the function of the corpora cavernosa in the penis?

    <p>To become enlarged and rigid during sexual stimulation</p> Signup and view all the answers

    What is the significance of the glans penis?

    <p>It contains the external urethral orifice</p> Signup and view all the answers

    What is the role of testosterone in the development of the male reproductive system?

    <p>It controls the descent of the testes into the scrotum</p> Signup and view all the answers

    What is the significance of the scrotum in the male reproductive system?

    <p>It allows for the production of viable sperm by regulating temperature</p> Signup and view all the answers

    What is the effect of cold temperatures on the testes?

    <p>They are elevated closer to the body</p> Signup and view all the answers

    Study Notes

    Spermatogenesis

    • Type B spermatogonium is pushed inward and becomes a primary spermatocyte.
    • Primary spermatocyte undergoes meiosis, which consists of two successive cell divisions that reduce the number of chromosomes in the daughter cells in half.
    • During meiosis I, chromosomes replicate and align as homologous pairs, and then separate into different secondary spermatocytes, each receiving only 23 replicated chromosomes.
    • In meiosis II, chromatids separate into different daughter cells, resulting in four spermatids with 23 chromosomes each.
    • Each spermatid loses its cytoplasm and forms a flagellum, eventually forming a sperm containing 23 chromosomes.

    Genetic Diversity of Sperm

    • Genetic diversity of sperm is created by two mechanisms: random alignment of paired homologous chromosomes during meiosis I, and crossover during meiosis I, which involves the exchange of DNA between paired homologous chromosomes.

    Sperm Anatomy

    • A sperm consists of three parts: head, acrosome, and flagellum.
    • The head contains a compact nucleus with 23 chromosomes.
    • The acrosome covers the nucleus and contains enzymes that help the sperm penetrate a secondary oocyte.

    Male Reproductive System

    • The primary functions of the male reproductive system are the production of male sex hormones, formation of sperm, and placement of sperm in the female reproductive tract.
    • The organs of the male reproductive system include paired testes, accessory ducts, accessory glands, and external genitalia.

    Testes

    • The testes are male gonads or sex glands that produce sperm.
    • Septa divide the testis into lobules, each containing several seminiferous tubules.
    • Spermatogenic cells in the seminiferous tubules divide to produce sperm, while supporting cells support and nourish spermatogenic cells and regulate sperm production.
    • Interstitial cells fill the spaces between seminiferous tubules and produce testosterone, the primary male sex hormone.

    Spermatogenesis Process

    • Spermatogenesis is the process that produces sperm by the division of spermatogenic cells.
    • It begins at puberty and continues for a lifetime, controlled by follicle-stimulating hormone (FSH) and luteinizing hormone (LH) and testosterone.

    Male Reproductive Tract

    • The male reproductive tract includes the epididymis, ductus deferens, ejaculatory duct, and urethra.
    • The epididymis is a comma-shaped, tightly coiled tube along the top and back of the testis, where sperm mature and are stored.
    • The ductus deferens extends from the epididymis and merges with the duct from the seminal vesicle, using peristalsis to move sperm.
    • The ejaculatory duct enters the prostate and merges with the urethra, contracting to mix seminal vesicle secretions with sperm and push them into the urethra during ejaculation.
    • The urethra extends from the urinary bladder through the penis to the external environment, transporting urine and carrying semen during ejaculation.

    Testosterone

    • Testosterone is the primary male sex hormone produced by interstitial cells in the testes.
    • At puberty, testosterone promotes the development of male secondary sex characteristics, including growth of body hair, increased muscular development, development of heavy bones, broad shoulders, and narrow pelvis, and deepening of the voice.
    • Testosterone production starts to decline around 40 years of age, resulting in a gradual decline in the functions of reproductive organs and secondary sex characteristics.

    Hormonal Control of Reproduction in Males

    • The onset of sexual development begins around 11-12 years old, completing around 15-17 years old.
    • At puberty, the hypothalamus secretes gonadotropin-releasing hormone (GnRH), which stimulates the anterior lobe of the pituitary gland to release two hormones: luteinizing hormone (LH) and follicle-stimulating hormone (FSH).
    • LH promotes growth of interstitial cells of the testes and stimulates production of testosterone, while FSH acts on supporting cells and works with testosterone to stimulate spermatogenesis.

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    Reproductive System Part 1 PDF

    Description

    Test your knowledge of the male reproductive system, including the structure and function of sperm, accessory ducts, and the male reproductive tract. Learn about the epididymis, ductus deferens, ejaculatory duct, and urethra.

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