Implantation and Development of the Embryo
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Questions and Answers

What is the primary function of the trophoblast enzymes during implantation?

  • To develop into the placenta
  • To produce blood cells
  • To break down tissue of the endometrium to obtain nutrients for the embryo (correct)
  • To form the chorionic villi
  • By the end of which week does the embryonic disc form the cylindrical neural tube?

  • 5th week
  • 2nd week
  • 8th week
  • 4th week (correct)
  • What is the term for the process of the formation of organs from the three primary germ layers?

  • Organogenesis (correct)
  • Morula formation
  • Cleavage
  • Gastrulation
  • Which layer of the embryonic disc gives rise to the nervous system?

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

    What is the stage of development characterized by a solid ball of cells?

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

    During which stage does the inner cell mass flatten to form the embryonic disc?

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

    What is the term for the movement of cells in the embryonic disc to form multiple layers?

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

    Which primary germ layer produces the epithelial linings of the digestive tract and respiratory tract?

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

    What is the stage of development characterized by a hollow ball consisting of the trophoblast and inner cell mass?

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

    During which stage does the heart start beating and limb buds form?

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

    During which stage of development does the mass of cells divide rapidly and become smaller?

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

    What is the term for the solid ball of approximately 16 cells that forms after cleavage?

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

    Which stage of development is characterized by the formation of the placenta and major organs?

    <p>Embryonic stage</p> Signup and view all the answers

    What is the term for the process of change through lifespan?

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

    During which stage of development does the inner cell mass organize into the embryoblast?

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

    What is the term for the hormone secreted by the trophoblast during implantation?

    <p>Human chorionic gonadotropin (hCG)</p> Signup and view all the answers

    What is the term for the structure that forms from cells that surround the embryo and cells from the endometrium?

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

    During which stage of development does the zygote move down the uterine tube?

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

    What is the term for the process of fertilization resulting in the formation of a zygote?

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

    What is the term for the stage of development that lasts from fertilization to the 8th week?

    <p>Embryonic stage</p> Signup and view all the answers

    What is the term for the stage of development that begins at the end of the 8th week and lasts until birth?

    <p>Fetal stage</p> Signup and view all the answers

    By the end of which week are external reproductive organs distinguishable as male or female?

    <p>12th week</p> Signup and view all the answers

    During which month does the body grow quickly, and the lower limbs lengthen?

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

    What happens to the skin during the 6th month of fetal development?

    <p>It becomes wrinkled, translucent, and reddish</p> Signup and view all the answers

    During which trimester do brain cells form rapidly, and organs mature as the fetus greatly increases in size?

    <p>Third trimester</p> Signup and view all the answers

    How many days after fertilization is a baby typically full-term and ready for birth?

    <p>266 days</p> Signup and view all the answers

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