Physiology of Pregnancy: Fertilization and Implantation
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Questions and Answers

When does implantation occur?

  • 3 days after fertilization
  • 6th - 7th days after ovulation (correct)
  • After the formation of morula
  • 12 weeks after fertilization

    • What is the function of the decidua basalis?

  • Protection against laws of transplantation immunology
  • Site of implantation & nutrition of blastocyst
  • Site of formation of the placenta (correct)
  • Embedding of the blastocyst by its embryonic pole into the decidua

    • What is the weight of a fully formed placenta?

  • 200 gm
  • 1 kg
  • 300 gm
  • 500 gm (correct)

    • What is the structure of the maternal surface of the placenta?

    <p>Dull red, rough, spongy, irregular &amp; divided into 15-20 cotyledons (D)</p> Signup and view all the answers

    What is formed at the ampulla of the Fallopian tube during fertilization?

    <p>(46 chromosome) zygote (C)</p> Signup and view all the answers

    Implantation occurs on the 4th - 5th days after ovulation

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

    The decidua is the modified secretory endometrium of pregnancy under the effect of only Progesterone

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

    The placenta is fully formed at 12 weeks and then decreases in size

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

    The fetal surface of the placenta is rough and irregular

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

    The mechanical attachment of the fetus to the mother is not a function of the placenta

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

    Study Notes

    Implantation

    • Occurs on the 4th - 5th days after ovulation

    Decidua

    • Modified secretory endometrium of pregnancy
    • Under the effect of only Progesterone
    • Decidua basalis is a part of the decidua

    Placenta

    • Fully formed at 12 weeks
    • Then decreases in size after 12 weeks
    • Fetal surface is rough and irregular
    • Not responsible for the mechanical attachment of the fetus to the mother

    Fertilization

    • Occurs at the ampulla of the Fallopian tube
    • Results in the formation of a zygote

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    Description

    Test your knowledge of the physiology of pregnancy with questions about fertilization, zygote formation, and implantation of the blastocyst. Learn about the union of ovum and spermatozoon, differentiation of the zygote, and the process of embedding the blastocyst into the uterine wall.

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