12)2nd Week of Development Implantation
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Questions and Answers

How long does each mitotic division take in the early embryo development?

  • 12 hours
  • 30 hours
  • 18 hours
  • 24 hours (correct)

    • What is the stage called when the borders of the blastomeres become invisible with each other and they are connected to each other?

  • Blastocyst stage
  • Morula stage
  • Compaction stage (correct)
  • Early blastocyst stage

    • How many cells are present in the blastocyst stage?

  • 200-500 cells (correct)
  • 50-100 cells
  • 500-1000 cells
  • 100-200 cells

    • What is the first cellular differentiation that occurs in the early embryo development?

    <p>First cellular differentiation occurs at the early blastocyst stage (D)</p> Signup and view all the answers

    How long after fertilization does the first cleavage occur?

    <p>24 hours (A)</p> Signup and view all the answers

    What is the term used to describe the cells produced by the cleavage process in the early embryo development?

    <p>Blastomeres (D)</p> Signup and view all the answers

    What is the outermost layer of the uterus called?

    <p>Perimetrium (A)</p> Signup and view all the answers

    Which phase of the menstrual cycle sees the thickening of the endometrium?

    <p>Follicular phase (A)</p> Signup and view all the answers

    When does uterine receptivity finish during the menstrual cycle?

    <p>20-24th day (B)</p> Signup and view all the answers

    What factors affect implantation?

    <p>Quality of the embryo (B)</p> Signup and view all the answers

    What happens if implantation does not occur during the menstrual cycle?

    <p>Menstruation occurs (D)</p> Signup and view all the answers

    In which phase does implantation occur?

    <p>Secretory phase (D)</p> Signup and view all the answers

    What is the primary function of the zona pellucida during early embryonic development?

    <p>To protect the embryo from the uterine environment (A)</p> Signup and view all the answers

    What is the term used to describe the process of the embryo emerging from the zona pellucida?

    <p>Hatching (C)</p> Signup and view all the answers

    What is the term used to describe the cavity within the blastocyst that is filled with fluid?

    <p>Blastocoele (B)</p> Signup and view all the answers

    Which of the following cell masses will eventually form the embryo?

    <p>Inner cell mass (ICM) (C)</p> Signup and view all the answers

    What is the term used to describe the cells in the blastocyst stage that can no longer transform into another cell type?

    <p>Pluripotent cells (C)</p> Signup and view all the answers

    Where does the implantation of the blastocyst typically occur within the uterus?

    <p>Posterior wall of the endometrium, close to the fundus (C)</p> Signup and view all the answers

    What is the duration of the implantation window?

    <p>6-10 days after ovulation (A)</p> Signup and view all the answers

    Which of the following factors affect endometrial receptivity and the implantation window?

    <p>Cytokines (IL-1β and IL-1α), β-HCG, and signaling mechanisms produced by the blastocyst (C)</p> Signup and view all the answers

    What is the first stage of implantation?

    <p>Apposition (C)</p> Signup and view all the answers

    What happens during the decidual reaction after the first attachment?

    <p>The endometrium undergoes changes, and decidua cells begin to synthesize and store lipid and glycogen (C)</p> Signup and view all the answers

    What happens during the penetration stage of implantation?

    <p>The blastocyst starts to secrete enzymes to break down the endometrium (C)</p> Signup and view all the answers

    What happens during the invasion stage of implantation?

    <p>The blastocyst becomes fully embedded in the endometrium (C)</p> Signup and view all the answers

    What is the function of the cytotrophoblast cells?

    <p>To form the syncytiotrophoblast layer (B)</p> Signup and view all the answers

    What is the bilaminar embryonic disc composed of?

    <p>Epiblast and hypoblast (C)</p> Signup and view all the answers

    Which layer of cells appears first on the surface of the embryoblast, facing the blastocyst cavity?

    <p>Hypoblast (B)</p> Signup and view all the answers

    What is the primary cause of multiple pregnancy?

    <p>Ovulation and fertilization of multiple oocytes (C)</p> Signup and view all the answers

    In the case of a monozygotic multiple pregnancy, how are the embryos related?

    <p>They have the same genetic material and are identical (D)</p> Signup and view all the answers

    How are dizygotic multiple pregnancies different from monozygotic ones?

    <p>They carry different genetic material (A)</p> Signup and view all the answers

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