Fertilization Process: From Sperm to Zygote
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Questions and Answers

Which of the following substances cross the placenta through simple diffusion?

  • Hormones and antibiotics
  • O2 and CO2 (correct)
  • Glucose and proteins
  • Amino acids and iron
  • During which weeks does the placenta take over the endocrine function from the corpus luteum?

  • Weeks 28-30
  • Weeks 12-17 (correct)
  • Weeks 9-12
  • Weeks 21-24
  • What is the primary function of relaxin during pregnancy?

  • Loosening the pelvis and dilating the cervix (correct)
  • Inhibiting contractions
  • Stimulating ovulation
  • Stimulating fetal development
  • What is the effect of increased estrogen levels during pregnancy?

    <p>Stimulating maternal tissue growth</p> Signup and view all the answers

    During which weeks does the fetal heart shift blood through the foramen ovale and the ductus arteriosus?

    <p>Weeks 9-12</p> Signup and view all the answers

    What is the primary function of hCG during pregnancy?

    <p>Stimulating male gonads to produce testosterone</p> Signup and view all the answers

    What is the result of fertilization?

    <p>The formation of a zygote with half genetic material from each parent</p> Signup and view all the answers

    What percentage of sperm are killed due to acidity during fertilization?

    <p>Almost immediately</p> Signup and view all the answers

    What is the purpose of capacitation?

    <p>To prepare the sperm for fertilization</p> Signup and view all the answers

    What are the two layers that surround the oocyte?

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

    What happens to the plasma membrane after fertilization?

    <p>It depolarizes to prevent more penetration</p> Signup and view all the answers

    What is the result of the acrosomal reaction?

    <p>Enzymes are released to penetrate the corona radiata and zona pellucida</p> Signup and view all the answers

    What is the gestation time for full fetal development?

    <p>Until birth</p> Signup and view all the answers

    What is the purpose of the yolk sac?

    <p>To provide nourishment to the embryo until the placenta is functional</p> Signup and view all the answers

    What is the result of implantation?

    <p>The blastocyst is implanted in the uterine wall</p> Signup and view all the answers

    When is the placenta complete?

    <p>By the end of week 12</p> Signup and view all the answers

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