Fertilization Process: From Sperm to Zygote
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Questions and Answers

Which of the following substances requires active transport across the placenta?

  • O2
  • Lipid soluble fetotoxic substances
  • CO2
  • Amino acids (correct)

During which weeks does the placenta take over the endocrine function from the corpus luteum?

  • 6-10
  • 12-17 (correct)
  • 18-22
  • 24-28

What is the primary function of relaxin during pregnancy?

  • Regulating blood sugar levels
  • Inhibiting contractions
  • Loosening the pelvis and dilating the cervix (correct)
  • Stimulating fetal development

How many calories per day should a pregnant woman increase her intake during the 2nd and 3rd trimesters?

<p>300 (C)</p> Signup and view all the answers

What is the name of the plug of mucus that covers the cervix and is expelled along with a small amount of blood before labor?

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

How many stages are there in the process of childbirth?

<p>4 (D)</p> Signup and view all the answers

What is the primary function of the foramen ovale and ductus arterioles in the infant's circulation?

<p>To close after birth and allow for separate circulation (B)</p> Signup and view all the answers

What is the primary function of prolactin in lactation?

<p>To establish and maintain the milk supply (C)</p> Signup and view all the answers

What is the genetic term for the expression of a gene's effect?

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

What is the term for an individual who carries a recessive gene that can be passed on to their offspring?

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

What is the primary function of brown fat in the infant?

<p>To regulate body temperature (C)</p> Signup and view all the answers

What is the term for the first milk produced by the mother, rich in immunoglobulins?

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

During fertilization, what is the purpose of the acrosomal reaction?

<p>To release enzymes to penetrate the corona radiata and zona pellucida (A)</p> Signup and view all the answers

What is the main function of the zona pellucida?

<p>To block the entry of multiple sperm (B)</p> Signup and view all the answers

What is the result of fertilization, in terms of the genetic material of the zygote?

<p>The zygote has half genetic material from the mother and half from the father (C)</p> Signup and view all the answers

What is the purpose of the fertilization membrane?

<p>To block the entry of additional sperm after fertilization (D)</p> Signup and view all the answers

What is the term for the process by which the sperm penetrates the layers surrounding the oocyte?

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

What is the term for the failure of a blastocyst to implant in the uterine wall?

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

What is the function of the yolk sac?

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

What is the term for the process by which the embryonic cells organize into three layers?

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

What is the function of the placenta in terms of gas exchange?

<p>To facilitate the exchange of gases and waste between the embryo and mother (D)</p> Signup and view all the answers

At what stage is the placenta fully developed?

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

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