Human Anatomy and Reproduction Quiz
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Questions and Answers

What is the diploid number of chromosomes in germ line cells?

  • 23
  • 92
  • 46 (correct)
  • 69
  • What type of division occurs in germ line cells to produce gametes?

  • Meiosis (correct)
  • Binary Fission
  • Bud Formation
  • Mitosis
  • How many chromosomes do gametes contain after division?

  • 46 chromosomes
  • 34 chromosomes
  • 15 chromosomes
  • 23 chromosomes (correct)
  • Which process contributes to genetic variability during meiosis?

    <p>Independent Assortment</p> Signup and view all the answers

    Which of the following statements about haploid and diploid cells is correct?

    <p>Diploid cells contain more genetic information than haploid cells.</p> Signup and view all the answers

    What is the haploid number of chromosomes found in each gamete?

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

    What happens to the chromosome number at fertilization?

    <p>It restores to diploid number</p> Signup and view all the answers

    During which phase of meiosis does chromosomal crossover primarily occur?

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

    What structure connects sister chromatids after chromosome replication?

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

    Which of the following best describes the difference between haploid and diploid cells?

    <p>Haploid cells contain one set of chromosomes, diploid cells two sets.</p> Signup and view all the answers

    What is the primary outcome of the separation phase during meiosis?

    <p>Separation of homologous pairs into two daughter cells</p> Signup and view all the answers

    How does meiosis contribute to genetic variability?

    <p>By allowing for crossing over and independent assortment</p> Signup and view all the answers

    Which term correctly describes cells with one complete set of chromosomes?

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

    What is the chromosome composition of daughter cells produced at the end of meiosis?

    <p>Haploid, with half the chromosome number of the parent cell</p> Signup and view all the answers

    What occurs during chromosomal crossover in meiosis?

    <p>Homologous chromosomes exchange segments of genetic material</p> Signup and view all the answers

    What is the primary purpose of meiosis in germ cells?

    <p>To reduce the chromosome number to the haploid number</p> Signup and view all the answers

    During which stage of meiosis do cells replicate their DNA?

    <p>At the beginning of meiosis I</p> Signup and view all the answers

    How many types of meiosis are there?

    <p>Two types</p> Signup and view all the answers

    What does meiosis achieve in terms of chromosome sets?

    <p>It reduces the chromosome number to one set</p> Signup and view all the answers

    What cell type do primordial germ cells develop into?

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

    What process do diploid oogonia undergo during early fetal development?

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

    What significant event occurs to most germ cells before birth?

    <p>They degenerate by atresia</p> Signup and view all the answers

    What is the ploidy level of oogonia?

    <p>Diploid (2n)</p> Signup and view all the answers

    How do diploid oogonia contribute to the number of germ cells before birth?

    <p>They divide by mitosis to produce millions</p> Signup and view all the answers

    What is the primary process that occurs during fertilization?

    <p>The fusion of male and female gametes</p> Signup and view all the answers

    Which statement about in vitro fertilization is accurate?

    <p>It can utilize gametes preserved for many years</p> Signup and view all the answers

    What is the result of the fusion of male and female gametes?

    <p>Development of a zygote</p> Signup and view all the answers

    Which component is essential for fertilization to occur?

    <p>Compatibility of gametes</p> Signup and view all the answers

    What is the significance of gametes being frozen for long durations in the context of in vitro fertilization?

    <p>It allows for indefinite storage without effect on viability</p> Signup and view all the answers

    What happens to the morula once it enters the uterine cavity?

    <p>Fluid penetrates through the zona pellucida.</p> Signup and view all the answers

    What is formed as a result of fluid penetrating the inner cell mass?

    <p>The blastocyst.</p> Signup and view all the answers

    What is the role of the zona pellucida during the morula's development?

    <p>It allows fluid entry into the intercellular spaces.</p> Signup and view all the answers

    Which cell structure is involved in the interaction between the morula and the uterine cavity?

    <p>Intercellular spaces.</p> Signup and view all the answers

    What type of tissues does the inner cell mass of the blastocyst eventually contribute to?

    <p>All germ layers.</p> Signup and view all the answers

    What is the role of hyaluronidase during fertilization?

    <p>To assist in the penetration of the zona pellucida</p> Signup and view all the answers

    Which of the following enzymes are involved in the lysis of the zona pellucida?

    <p>Acrosin, esterases, &amp; neuraminidase</p> Signup and view all the answers

    What is the end result of the fusion of plasma cell membranes in fertilization?

    <p>Creation of a diploid zygote</p> Signup and view all the answers

    What is the significance of acrosomal enzymes in sperm function?

    <p>They facilitate penetration of the zona pellucida</p> Signup and view all the answers

    Which of the following processes occurs after the zona pellucida is lysed?

    <p>Sperm has a direct path to the oocyte</p> Signup and view all the answers

    What is the zona reaction responsible for during fertilization?

    <p>Making the zona pellucida impermeable to additional sperm</p> Signup and view all the answers

    What occurs at the completion of the second meiotic division of the oocyte?

    <p>The formation of a mature ovum and a second polar body</p> Signup and view all the answers

    Which change in the zona pellucida is crucial for preventing polyspermy?

    <p>Alteration in the molecular structure of the zona</p> Signup and view all the answers

    What is the outcome of the second meiotic division in oogenesis?

    <p>One large ovum and a smaller polar body are produced</p> Signup and view all the answers

    How does the zona reaction impact the fertilization process?

    <p>It prevents further sperm from entering after the first sperm has fertilized the ovum</p> Signup and view all the answers

    What occurs during prophase of mitosis?

    <p>Chromosomes begin to coil and condense</p> Signup and view all the answers

    Which stage of mitosis is characterized by the alignment of chromosomes at the equatorial plane?

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

    What major event occurs during anaphase of mitosis?

    <p>Chromatid migration to opposite poles</p> Signup and view all the answers

    At which stage of mitosis do daughter cells begin to form?

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

    What is the primary role of mitotic spindles during mitosis?

    <p>To separate sister chromatids</p> Signup and view all the answers

    What is the function of the kinetochore during cell division?

    <p>To attach spindle fibers to chromosomes</p> Signup and view all the answers

    What is located at the centromere of a chromosome?

    <p>The point where sister chromatids are held together</p> Signup and view all the answers

    Which statement accurately describes a kinetochore?

    <p>It is a protein complex where spindle fibers attach</p> Signup and view all the answers

    During which cellular process is the kinetochore specifically active?

    <p>Cell division</p> Signup and view all the answers

    What is the primary role of the centromere in relation to sister chromatids?

    <p>To connect the sister chromatids during division</p> Signup and view all the answers

    What is the typical number of sperm that can enter the uterus during reproduction?

    <p>200-600 million</p> Signup and view all the answers

    What characteristic of sperm allows them to travel through the vagina effectively?

    <p>Highly motile properties</p> Signup and view all the answers

    What role does the isthmus play in the journey of sperm?

    <p>It aids in the peristaltic movement of sperm.</p> Signup and view all the answers

    In which part of the female reproductive system do sperm become highly motile?

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

    Why is the motility of sperm critical for reproduction?

    <p>It allows sperm to reach the egg quickly.</p> Signup and view all the answers

    What is the process called where homologous chromosomes align themselves in pairs during meiosis?

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

    How do homologous chromosomes align themselves during synapsis?

    <p>They align in pairs, point for point.</p> Signup and view all the answers

    Which chromosome combination is noted as an exception during the pairing of homologous chromosomes?

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

    What is a characteristic of the alignment of homologous chromosomes during synapsis?

    <p>It is exact and point for point.</p> Signup and view all the answers

    Which of the following statements is true about synapsis during meiosis?

    <p>It is essential for the pairing of homologous chromosomes.</p> Signup and view all the answers

    What is formed when the intercellular spaces become confluent during embryonic development?

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

    Which term describes the cavity that forms within the blastocyst during early embryonic development?

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

    At what stage does an embryo become a blastocyst?

    <p>When the blastocele forms</p> Signup and view all the answers

    What developmental stage follows the merging of intercellular spaces in embryogenesis?

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

    Which structure is indicative of the transition into the stage of a blastocyst in embryology?

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

    What is the primary event that occurs during implantation?

    <p>The penetration of the trophoblastic layer into the endometrium</p> Signup and view all the answers

    On which days does the process of implantation typically start and complete?

    <p>6th-8th day and completed by the 12th day</p> Signup and view all the answers

    What is the state of the endometrium during implantation?

    <p>Thick and nutrient-rich to support the developing embryo</p> Signup and view all the answers

    What is the role of the trophoblast during the implantation process?

    <p>To facilitate the entry of the blastocyst into the uterine lining</p> Signup and view all the answers

    Which statement accurately describes the timing of implantation?

    <p>It initiates on the 6th day and concludes by the 12th day</p> Signup and view all the answers

    What term describes stem cells that can differentiate into various cell types?

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

    Which anatomical term refers to the front of the body?

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

    What is the diploid number of chromosomes in somatic cells?

    <p>46</p> Signup and view all the answers

    In embryonic terminology, which term refers to the tail end of the body?

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

    Which type of cell division do somatic cells undergo?

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

    What is the primary function of the kinetochore during cell division?

    <p>To facilitate the movement of chromosomes</p> Signup and view all the answers

    Which of the following statements is true about the centromere?

    <p>It is the region where sister chromatids are joined.</p> Signup and view all the answers

    What role do spindle fibers serve in relation to the kinetochore?

    <p>They attach to the kinetochore for chromosomal movement.</p> Signup and view all the answers

    What happens to sister chromatids after the centromere divides?

    <p>They are pulled apart toward opposite poles of the cell.</p> Signup and view all the answers

    Which structure is required for the attachment of spindle fibers during mitosis?

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

    At what stage of life does spermatogenesis begin in males?

    <p>At puberty</p> Signup and view all the answers

    What is the duration required for spermatogenesis to complete one cycle?

    <p>64 days</p> Signup and view all the answers

    During which phase does oogenesis resume in females?

    <p>At puberty</p> Signup and view all the answers

    When do females begin the process of gametogenesis?

    <p>During the fetal period</p> Signup and view all the answers

    What transformation occurs in spermatogenesis?

    <p>Spermatogonia into spermatozoa</p> Signup and view all the answers

    What is a primary result of the crossover that occurs during meiotic divisions?

    <p>Redistribution of genetic material leading to genetic variability</p> Signup and view all the answers

    How does meiosis contribute to the genetic diversity of daughter cells?

    <p>Through the process of genetic recombination</p> Signup and view all the answers

    What occurs to the chromosomes in the daughter cells at the end of meiotic divisions?

    <p>Each daughter cell receives different combinations of chromosomes</p> Signup and view all the answers

    Which statement accurately describes the outcome of meiotic divisions?

    <p>Four genetically different daughter cells are produced</p> Signup and view all the answers

    Which process is primarily responsible for the genetic variability observed in daughter cells after meiosis?

    <p>Crossover and genetic recombination</p> Signup and view all the answers

    Which structure facilitates fluid penetration in the morula?

    <p>Zona pellucida</p> Signup and view all the answers

    Which of the following best describes the function of the zona pellucida in early development?

    <p>Protecting the inner cell mass from external factors</p> Signup and view all the answers

    Which component of the morula is primarily involved in the formation of tissues in the embryo?

    <p>Inner cell mass</p> Signup and view all the answers

    What process occurs when homologous chromosomes align themselves in pairs during meiosis?

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

    Which statement is true regarding the alignment of homologous chromosomes during synapsis?

    <p>It is exact and point for point except for XY combinations.</p> Signup and view all the answers

    What distinguishes the alignment of XY chromosomes from other homologous pairs during synapsis?

    <p>They align differently, lacking point-for-point pairing.</p> Signup and view all the answers

    Which aspect of synapsis contributes to the genetic diversity in gametes?

    <p>Point-for-point alignment and potential crossover.</p> Signup and view all the answers

    What is the main significance of the exact and point-for-point pairing of homologous chromosomes during meiosis?

    <p>To facilitate accurate genetic recombination.</p> Signup and view all the answers

    What is the first stage in the development of sperm cells from spermatogonia?

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

    During meiosis, what type of cells are directly produced from spermatocytes?

    <p>Haploid spermatids</p> Signup and view all the answers

    What is the ploidy level of spermatogonia before they undergo spermatocytogenesis?

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

    What is the primary characteristic of the cells produced after meiosis in spermatogenesis?

    <p>They contain a single copy of each chromosome.</p> Signup and view all the answers

    Which process occurs after spermatocytogenesis and before the formation of mature sperm?

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

    What is the maximum time frame during which an oocyte must be fertilized to avoid degeneration?

    <p>12 hours</p> Signup and view all the answers

    What physiological process has increased activity without any morphological changes in the uterus or uterine tubes?

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

    What happens to oocytes that are not fertilized within a certain period?

    <p>They degenerate</p> Signup and view all the answers

    In which part of the female reproductive system does the fertilization of an oocyte predominantly occur?

    <p>Uterine tubes</p> Signup and view all the answers

    What is a key consequence of fertilization occurring beyond the viable time frame for an oocyte?

    <p>Degeneration of the oocyte</p> Signup and view all the answers

    What role does the syncytiotrophoblast play during implantation?

    <p>It facilitates the embedding of the blastocyst into the endometrium.</p> Signup and view all the answers

    What occurs immediately after the blastocyst becomes embedded in the endometrium?

    <p>Closure of the implantation site by a fibrin clot.</p> Signup and view all the answers

    Which description best fits the function of the multinucleated protoplasmic mass formed during implantation?

    <p>It has a phagocytic function for debris clearance.</p> Signup and view all the answers

    What significant change occurs to the uterine wall after the blastocyst's embedment?

    <p>Regeneration of surface epithelial cells covering the implantation site.</p> Signup and view all the answers

    Which process is primarily facilitated by the syncytiotrophoblast during early pregnancy?

    <p>Digestion of uterine tissue.</p> Signup and view all the answers

    What does it mean for an embryo to be viable?

    <p>It is able to survive independently outside the uterus.</p> Signup and view all the answers

    Which description aligns with the term 'viable' in embryonic development?

    <p>Capable of independent function without maternal support.</p> Signup and view all the answers

    At what stage is an embryo considered viable?

    <p>When it has reached sufficient maturity to survive outside the uterus.</p> Signup and view all the answers

    What is a primary result of meiotic divisions that contributes to the diversity of daughter cells?

    <p>Crossover that redistributes genetic material</p> Signup and view all the answers

    Which statement accurately describes the chromosomal content of the daughter cells after meiosis?

    <p>Each daughter cell contains a unique combination of chromosomes</p> Signup and view all the answers

    Why is viability an important concept in developmental biology?

    <p>It indicates the point at which an embryo can survive away from maternal resources.</p> Signup and view all the answers

    How does the concept of viability influence pregnancy outcomes?

    <p>It influences decisions around prenatal care and intervention strategies.</p> Signup and view all the answers

    Which mechanism primarily ensures genetic variability during the process of meiosis?

    <p>Independent assortment of homologous chromosomes</p> Signup and view all the answers

    Which of the following correctly describes the genetic material distribution in the daughter cells post-meiosis?

    <p>Random distribution leading to diverse genetic combinations</p> Signup and view all the answers

    What aspect of meiosis primarily contributes to the genetic differences between the four daughter cells?

    <p>The occurrence of chromosomal crossover</p> Signup and view all the answers

    What is the first phase that sperm encounters during fertilization that is critical for its passage?

    <p>Corona radiata</p> Signup and view all the answers

    Which enzyme is specifically mentioned as playing a role in the fertilization process related to the sperm?

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

    What is the primary function of the hyaluronidase enzyme during the fertilization process?

    <p>To lyse the zona pellucida</p> Signup and view all the answers

    In the context of fertilization, what structure must the sperm penetrate first after leaving the male body?

    <p>Cumulus layers</p> Signup and view all the answers

    Which of the following sequences is indicative of the initial interaction of sperm with the egg during fertilization?

    <p>Navigating corona radiata then acrosome reaction</p> Signup and view all the answers

    Germ line cells have a haploid number of chromosomes equal to 23.

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

    Meiosis results in gametes that possess the diploid number of chromosomes.

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

    A germ cell divides by mitosis to produce gametes.

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

    During meiosis, each germ cell divides twice to produce four gametes.

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

    The diploid number of chromosomes in humans is represented as 1n.

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

    Spermatogenesis in males begins as early as the age of 10.

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

    Oogenesis in females begins during the fetal period and resumes at puberty.

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

    The process of spermatogenesis requires approximately 45 days to complete.

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

    Gametogenesis in males and females occurs at the same developmental stage.

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

    Transformation of spermatogonia into spermatozoa is a lengthy process that can take up to two months.

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

    After puberty, meiosis I resumes in several secondary follicles, with only one follicle maturing fully to produce three haploid cells.

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

    Meiosis I results in the formation of two diploid cells.

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

    The secondary oocyte is the only cell that resumes meiosis after puberty.

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

    One of the outcomes of meiosis I is the production of identical sister chromatids.

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

    At the end of meiosis I, a secondary oocyte and a polar body are formed, both carrying genetic variations.

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

    The primary follicle develops into a secondary follicle when a cavity known as the antrum begins to form.

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

    In the formation of a secondary follicle, the cells surrounding the oocyte release a solid substance instead of fluid into the antrum.

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

    The emergence of the antrum is a definitive characteristic that marks the follicle as a primary follicle.

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

    As the follicle matures and becomes a secondary follicle, the oocyte remains unchanged and does not undergo any developmental stages.

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

    Cells around the oocyte cease to function once the follicle transforms into a secondary follicle.

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

    A secondary oocyte is a small cell that cannot be seen by the naked eye.

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

    The secondary oocyte remains in metaphase until fertilization occurs.

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

    After fertilization, the secondary oocyte will not resume meiosis II.

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

    The trophoblast is the inner cell layer of the late blastocyst that develops into the embryonic part of the placenta.

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

    At puberty, a female's ovary contains approximately 1 million mature secondary oocytes ready for ovulation.

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

    The zona pellucida is a covering of material that surrounds the secondary oocyte during follicle development.

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

    The zona pellucida is shed during the hatching process of the late blastocyst on day 5.

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

    On day 5 of development, blastomeres in the late blastocyst give rise to the mesoderm layer.

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

    The late blastocyst stage is characterized by the formation of the inner cell mass, which eventually contributes to the embryonic structures.

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

    The trophoblast layer is responsible for the initial establishment of the embryo's nutrition supply.

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

    Study Notes

    Trimester

    • Pregnancy is divided into 3 calendar months, 9 total months.
    • Abortion is the expulsion of an embryo or fetus before it's viable.
    • Viable means mature enough to survive outside the uterus.

    Directional Terminology and Body Planes

    • Anatomical position:
      • Anterior/Posterior
      • Superior/Inferior
      • Lateral/Medial
      • Caudal/Cranial
      • Dorsal/Ventral
      • Sagittal plane
      • Coronal section
      • Frontal plane
      • Transverse section

    Types of Cells

    • Somatic cells have 2 sets of chromosomes (diploid number = 46) and divide by mitosis.
    • Germ cells also have 2 sets of chromosomes (diploid number = 46) and divide by meiosis to produce gametes.
    • Gametes have 1 set of chromosomes (haploid number = 23).
    • Embryonic gametes form in the epiblast, then migrate to the yolk sac and gonads.
    • Humans have 23,000 genes on 46 chromosomes.
    • In somatic cells, chromosomes appear as 23 homologous pairs.
    • 22 pairs are autosomes, and 1 sex pair (XX = female, XY = male).
    • Each gamete (egg/sperm) has 23 chromosomes.
    • Fertilization restores the diploid number of 46 chromosomes.
    • Centromere: connects sister chromatids after chromosome replication.
    • Kinetochore: protein complex where spindle fibers attach during cell division.

    Cell Division

    • Mitosis: produces 2 identical daughter cells.
      • DNA replicates before mitosis.
      • Prophase, Prometaphase, Metaphase, Anaphase, Telophase, Daughter cells
      • Chromosomes condense and become visible.
      • Spindle fibers attach to chromosomes.
      • Chromosomes line up at the middle of the cell.
      • Sister chromatids separate.
      • New nuclei form, and cytoplasm divides.
    • Meiosis: specialized cell division for creating gametes.
      • Results in 4 daughter cells with half the number of chromosomes as the parent cell (haploid).
      • Two stages: Meiosis I and Meiosis II
      • Includes crossover: exchange of chromatid segments between paired homologous chromosomes
      • Genetic variation
      • Random distribution of homologous chromosomes

    Gametogenesis

    • Spermatogenesis (male): production of sperm, begins at puberty, occurs continuously, takes place in the seminiferous tubules of the testes.
    • Oogenesis (female): production of eggs, begins before birth, occurs cyclically, takes place in the ovaries.
    • These processes have multiple stages, important for cell division and maturation, and each has distinct phases and timing.

    Transport (Reproduction)

    • Sperm travels from the epididymis to the vagina via peristaltic movement.
    • Secretions from glands form semen.
    • Millions of sperm are produced (200 - 600 million).
    • Sperm mobility is high.
    • Oocyte moves through the Fallopian tubes.
    • Fimbriae aid movement and guidance.

    Fertilization

    • Fusion of male and female gametes
    • Occurs in the ampulla of fallopian tube.
    • Sperm must penetrate the corona radiata and zona pellucida.
    • Fusion triggers completion of meiosis II in the egg
    • Formation of the zygote.

    Cleavage of the Zygote

    • Repeated mitotic divisions of the zygote.
    • Formation of blastomeres
    • Blastomeres compact.
    • Morula
    • Blastocyst
    • Implantation: blastocyst implants in the uterine endometrium.
    • Blastocyst has two main parts:
      • Trophoblast outer layer
      • Inner Cell Mass (embryoblast): will develop into the embryo.
      • Blastocyst is in the uterine cavity for about 5 days
      • The zona pellucida degrades

    Blastogenesis

    • Early stages of embryo development
    • Formation of the blastocyst with the 2 main cell groups (trophectoderm and inner cell mass).
    • Zygote undergoes division forming a blastula and then blastocyst to implantation in uterine wall.

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    Description

    Test your knowledge on human anatomy, pregnancy trimesters, and cell types. This quiz covers key concepts including anatomical position, body planes, and the division of different cell types in reproduction. Prepare to explore the fascinating details of human biology.

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