Fertilization Process
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Fertilization Process

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Questions and Answers

Which of the following substances does not require active transport across the placenta?

  • Nicotine
  • Iron
  • Amino acids
  • Oxygen (correct)
  • When does the placenta take over the endocrine function from the corpus luteum?

  • Weeks 12-17 (correct)
  • Weeks 28-30
  • Weeks 6-10
  • Weeks 20-24
  • What is the significance of the hormone relaxin during pregnancy?

  • It stimulates protein synthesis
  • It inhibits contractions
  • It stimulates ovulation
  • It loosens the pelvis and dilates the cervix (correct)
  • What is the approximate increase in daily caloric intake required during the 2nd and 3rd trimesters of pregnancy?

    <p>300 calories</p> Signup and view all the answers

    What is the physiological response that occurs about 2 days before labor, indicating the onset of childbirth?

    <p>A plug of mucus covering the cervix is expelled</p> Signup and view all the answers

    What is the purpose of the hormone oxytocin during labor?

    <p>To intensify contractions</p> Signup and view all the answers

    What is the result of the fusion of the sperm and oocyte nuclei during fertilization?

    <p>A cell with half genetic material from the mother and half from the father</p> Signup and view all the answers

    Why are millions of sperm killed during fertilization?

    <p>All of the above</p> Signup and view all the answers

    What is the purpose of capacitation in sperm?

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

    What are the two layers that surround the oocyte?

    <p>Corona radiata and zona pellucida</p> Signup and view all the answers

    What is the result of the acrosomal reaction during fertilization?

    <p>The release of enzymes that help the sperm penetrate the oocyte's layers</p> Signup and view all the answers

    What is the fertilization membrane?

    <p>A barrier that prevents further sperm penetration</p> Signup and view all the answers

    What is the term for the process of the zygote and associated membranes moving to the uterus?

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

    What is the purpose of hCG during implantation?

    <p>To maintain the health of the corpus luteum</p> Signup and view all the answers

    What is the term for the primitive excertory duct that will become part of the urinary bladder?

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

    What is the term for the process by which the embryo develops from a flat sheet of cells to a cylindrical shape?

    <p>Embryonic folding</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 adjust circulation after birth</p> Signup and view all the answers

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

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

    What is the role of prolactin in lactation?

    <p>To establish and maintain the supply of breast milk</p> Signup and view all the answers

    What is the composition of colostrum secreted in the first 72 hours after birth?

    <p>A small amount of milk with high levels of immunoglobulins</p> Signup and view all the answers

    What is the term for the expression of an individual's genotype?

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

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