Fertilization Process: From Sperm to Zygote
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Questions and Answers

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

  • To facilitate gas exchange
  • To regulate body temperature
  • To close after birth (correct)
  • To increase blood pressure
  • What is the main component of colostrum that provides immunity to the infant?

  • Hormones
  • Antibodies
  • Immunoglobulins (correct)
  • Prolactin
  • What is the term for the expression of a gene's effect on an organism's physical appearance?

  • Genotype
  • Phenotype (correct)
  • Heterozygous
  • Homozygous
  • What is the term for an individual who carries a recessive allele that can be passed on to their offspring?

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

    What is the process by which the uterus returns to its pre-pregnancy size after birth?

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

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

    <p>Regulation of body temperature</p> Signup and view all the answers

    What happens to the majority of sperm during fertilization?

    <p>They are killed due to acidity and blocked by cervical mucus</p> Signup and view all the answers

    What is the process called when the sperm releases enzymes to penetrate the corona radiata and zona pellucida?

    <p>Acrosomal reaction</p> Signup and view all the answers

    What is the layer that surrounds the embryo and is filled with fluid for protection?

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

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

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

    What is the percentage of blastocysts that fail to implant in the uterus?

    <p>50%-75%</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 process called when the cells of the embryonic disc become three layers?

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

    What is the purpose of the yolk sac during embryonic development?

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

    What is the term for the indentation in the embryonic disc where new cells travel to form endoderm or mesoderm?

    <p>Primitive streak</p> Signup and view all the answers

    When is the placenta fully developed and functional?

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

    What substances cross the placenta through active transport?

    <p>Amino acids and iron</p> Signup and view all the answers

    When does sexual differentiation begin?

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

    What is the purpose of relaxin during fetal development?

    <p>To loosen the pelvis and dilate the cervix</p> Signup and view all the answers

    Why is progesterone important during fetal development?

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

    What is the normal caloric intake for a pregnant woman during the 1st trimester?

    <p>Normal caloric intake</p> Signup and view all the answers

    What is the purpose of oxytocin during childbirth?

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

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