Spermatocytogenesis Quiz
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Spermatocytogenesis Quiz

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Questions and Answers

What significant development occurs in the embryo during the first lunar month?

  • The heart begins to beat. (correct)
  • All vital organs are formed.
  • The embryo reaches 1 inch in length.
  • Distinct fingers and toes are visible.

    • What is the role of Sertoli cells during the maturation of spermatozoa?

  • They initiate mitotic division in spermatogonia.
  • They secrete testicular fluid that transports spermatozoa. (correct)
  • They provide nutrients to spermatogonia.
  • They phagocytose residual bodies during sperm development. (correct)

    • By the end of the second lunar month, what has happened to the embryo?

  • All vital organs are formed. (correct)
  • Fetal movements can be felt by the mother.
  • The heart has divided into chambers.
  • The embryo can be identified as human.

    • What is true about the development of the heart during the first month?

    <p>It is no larger than a poppy seed.</p> Signup and view all the answers

    Which process is responsible for the initial division of spermatogonia?

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

    What occurs during the 4th lunar month of fetal development?

    <p>Permanent teeth buds form.</p> Signup and view all the answers

    What happens to primary spermatocytes after DNA duplication?

    <p>They undergo meiosis I to produce secondary spermatocytes.</p> Signup and view all the answers

    How do mature spermatozoa gain motility?

    <p>Through muscle contraction in the epididymis.</p> Signup and view all the answers

    At what stage can fetal movements typically be felt by the mother?

    <p>4th lunar month.</p> Signup and view all the answers

    What do secondary spermatocytes ultimately divide into?

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

    What is the primary function of the placenta by the end of the second lunar month?

    <p>To provide nutrition and support to the embryo.</p> Signup and view all the answers

    Which of the following is true about the embryo's development by the 3rd lunar month?

    <p>Kidneys are functional and urine is formed.</p> Signup and view all the answers

    What is the fate of the excess cytoplasm during sperm maturation?

    <p>It is phagocytosed by Sertoli cells.</p> Signup and view all the answers

    What initiates the transition from non-motile spermatozoa to mature spermatozoa?

    <p>Passage into the epididymis.</p> Signup and view all the answers

    What does lanugo refer to in fetal development?

    <p>A layer of downy hair covering the fetus.</p> Signup and view all the answers

    Which of the following statements about spermatogenesis is true?

    <p>Secondary spermatocytes are haploid in nature.</p> Signup and view all the answers

    What is the primary role of the amniotic fluid during fetal development?

    <p>To absorb shock and protect the fetus from injury.</p> Signup and view all the answers

    Which structure provides a separation between the blastocyst and the uterine cavity?

    <p>Decidua Capsularis</p> Signup and view all the answers

    What are chorionic villi primarily responsible for?

    <p>Facilitating the exchange of nutrients and waste.</p> Signup and view all the answers

    What is the composition of the chorion?

    <p>Trophoblast and mesoderm.</p> Signup and view all the answers

    What is the primary function of the decidua parietalis?

    <p>To line the amniotic cavity.</p> Signup and view all the answers

    What is the pH level of the amniotic fluid, and what is its significance?

    <p>pH 7.2; indicates an alkaline environment that protects the fetus.</p> Signup and view all the answers

    Which of the following layers is NOT part of the chorion?

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

    What is the role of the trophoblast in fetal development?

    <p>To provide nutrients and support to the fetus.</p> Signup and view all the answers

    What is the role of the amnion during pregnancy?

    <p>It serves as a protective barrier for the embryo.</p> Signup and view all the answers

    Which part of the decidua is associated with implantation?

    <p>Decidua basalis</p> Signup and view all the answers

    Which of the following correctly describes the chorion?

    <p>It is involved in the formation of the placenta.</p> Signup and view all the answers

    What are chorionic villi responsible for?

    <p>Exchanging nutrients and gases between maternal and fetal blood.</p> Signup and view all the answers

    How is the decidua capsularis positioned in relation to the embryo?

    <p>It surrounds the embryo like a capsule.</p> Signup and view all the answers

    What happens to the decidua at the time of delivery?

    <p>It is shed off from the uterus.</p> Signup and view all the answers

    What is not a function of the fetal membranes?

    <p>Providing hormones to the mother</p> Signup and view all the answers

    Where does the Decidua parietalis reside?

    <p>On the opposite side of the uterus wall</p> Signup and view all the answers

    What is the primary function of the placenta?

    <p>Nutrient and gas exchange</p> Signup and view all the answers

    How many cotyledons does the placenta contain?

    <p>30</p> Signup and view all the answers

    What is Wharton's jelly?

    <p>A protective substance in the umbilical cord</p> Signup and view all the answers

    Which of these hormones is NOT produced by the placenta?

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

    What role does the placenta play in immunological protection?

    <p>It allows maternal antibodies (IgG) to pass to the fetus</p> Signup and view all the answers

    Which feature distinguishes the umbilical cord?

    <p>It connects the fetus to the placenta</p> Signup and view all the answers

    At what stage does the placenta fully develop?

    <p>Third month of pregnancy</p> Signup and view all the answers

    What is the maximum weight range of a fully developed placenta?

    <p>400-600 grams</p> Signup and view all the answers

    Study Notes

    Spermatogenesis

    • Spermatogonia undergo specific mitotic division to maintain a steady supply for gametogenesis.
    • Primary spermatocytes are produced from diploid spermatogonia, which exist in seminiferous tubules.
    • Each primary spermatocyte duplicates DNA and undergoes meiosis I, resulting in two haploid secondary spermatocytes.
    • Secondary spermatocytes further divide to create haploid spermatids.
    • Non-motile spermatozoa transported to the epididymis gain motility and fertilization capability.
    • Muscle contractions facilitate movement of mature spermatozoa through the male reproductive system rather than sperm motility.
    • Testosterone promotes cytoplasmic reduction in spermatids, with residual bodies scavenged by Sertoli cells.

    Fetal Development Timeline

    • 1st Lunar Month:

      • Embryo measures 0.6 cm, with initial heartbeats occurring 20 days post-fertilization.
      • Organ development starts in week three, with basic vertebrate features and structural formations evident.

    • 2nd Lunar Month:

      • All vital organs formed by week 8; sex organs develop by the end of this phase.
      • Embryo size reaches approximately 1 inch with distinct features like slightly webbed fingers.

    • 3rd Lunar Month:

      • Kidneys functional by the 12th week, urine formation begins.
      • Fetal movements become detectable, and lanugo (downy hair) appears.

    • 4th Lunar Month:

      • Fetus measures 18 cm, significant skeletal development, and physical human features become pronounced.
      • Heartbeat audible via fetoscope.

    Fetal Membranes and Special Structures of Pregnancy

    • Decidua:

      • Part of the endometrium modified for pregnancy; consists of decidua basalis, capsularis, and parietalis.
      • Decidua basalis forms the fetal portion of the placenta and interacts with the blastocyst.

    • Amnion:

      • Shiny inner membrane enclosing the amniotic cavity, protecting the embryo and maintaining fluid levels.

    • Chorion:

      • Outer membrane providing structural support of the placenta and fetal membranes.
      • Contains chorionic villi for nutrient, gas, and waste exchange between mother and fetus.

    Placenta Features and Functions

    • A transient organ weighing 400-600 grams, developing fully by the 3rd month.
    • Acts as an endocrine organ and protective barrier against certain substances.
    • Major functions include respiration, nutrition, excretion of waste, and immunological protection.

    Umbilical Cord

    • Measures 21 inches and 2 cm in thickness, connecting fetus to placenta, containing two arteries and one vein.
    • Wharton’s jelly supports the vessels, preventing kinks and knots.
    • No pain receptors are present in the umbilical cord, facilitating nutrient transport and waste excretion.

    Placental Barrier

    • Maintains separation between maternal and fetal blood, preventing antigenic reactions.
    • Provides immunity to the fetus via maternal antibodies (IgG).

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    Related Documents

    CMCA_ PRELIMS (UPDATED).pdf

    Description

    This quiz covers the process of spermatocytogenesis, examining how certain types of spermatogonia divide to maintain the gametogenic supply necessary for spermatogenesis. Test your understanding of the cell division and developmental stages involved in male gamete formation.

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