Block 1 Mini 1 Pt 2 Placenta Dr Kalli

13 Questions | Total Attempts: 269

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Block 1 Mini 1 Pt 2 Placenta Dr Kalli

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Questions and Answers
  • 1. 
    The absence of a ventral double-fold of coelomic membrane connecting the heart to the ventral body wall (a ventral mesocardium) is a result of
    • A. 

      Degeneration of this mesentery

    • B. 

      Formation of the pericardiopleural canals

    • C. 

      Formation of the pleuroperitoneal canals

    • D. 

      Absence of a ventral mesentery on the ventral body wall below the ligamentum teres

    • E. 

      A bilateral connection of the early intraembryonic coelom rostral to the developing heart

  • 2. 
    After the twentieth week of gestation, a thinned vasculosyncytial placental membrane is formed consisting of the following three layers:
    • A. 

      Syncytiotrophoblast – cytotrophoblast – fetal capillary endothelium

    • B. 

      Maternal capillary endothelium - syncytiotrophoblast – fetal capillary epithelium

    • C. 

      Syncytiotrophoblast – connective tissue of the villus – fetal capillary endothelium

    • D. 

      Connective tissue of the villus – syncytiotrophoblast - maternal capillary endothelium

    • E. 

      Maternal capillary endothelium – syncytiotrophoblast – cytotrophoblas

  • 3. 
    • A. 

      She postpone the surgery until after the birth of her child

    • B. 

      She postpone the surgery until the third trimester of her pregnancy

    • C. 

      She immediately have the surgery with post-operative progesterone supplements

    • D. 

      She immediately have the surgery with estrogen supplements

    • E. 

      She immediately have the surgery with no hormonal steroid supplements

  • 4. 
    Ectopia cordis or Pentalogy of Cantrell is a congenital malformation of the anterior body wall that includes a defect of the lower sternum, a deficient anterior diaphragm, and a heart that lies outside the chest. This condition is primarily a defect in what embryological process?
    • A. 

      Formation of the intraembryonic coelom

    • B. 

      Lateral folding

    • C. 

      Formation of the intermediate mesoderm

    • D. 

      Longitudinal folding

    • E. 

      Formation of the head fold

  • 5. 
    Through which blood vessel does the most oxygenated blood flow to supply the fetus?
    • A. 

      Umbilical artery

    • B. 

      Pulmonary artery

    • C. 

      Aorta

    • D. 

      Femoral artery

    • E. 

      Internal carotid artery

  • 6. 
    During Stage 3 of labor, the placenta separates at which layer from the uterus?
    • A. 

      Spongy layer of the decidua basalis

    • B. 

      At the chorionic plate

    • C. 

      Between the chorion and the amnion

    • D. 

      Between the smooth chorion (chorion leave) and the decidua parietalis

    • E. 

      At the umbilical cord

  • 7. 
    Which hormone is first produced by the syncytiotrophoblast cells of the early placenta to maintain the viability of the corpus luteum?
    • A. 

      Progesterone

    • B. 

      Relaxin

    • C. 

      Human chorionic gonadotropin

    • D. 

      Ectoderm

    • E. 

      Adrenocorticotropin hormone

  • 8. 
    During the final stages of fetal development (5 months to term) the placental barrier is composed of
    • A. 

      Syncytiotrophoblast and endothelial of fetal capillaries

    • B. 

      Cytotrophoblast and endothelial of fetal capillaries

    • C. 

      Syncytiotrbphoblast, cytotrophoblast, mesenchyme and endothelial of fetal capillaries

    • D. 

      Decidua basalis, syncytiotrophchlast and cytotrophoblast

    • E. 

      Decidua parietalis and chorionic frondosum

  • 9. 
    Which one of the following substances crosses the placental barrier?
    • A. 

      IgA

    • B. 

      Hormones from the pituitary gland

    • C. 

      Maternal cholesterol

    • D. 

      IgG

    • E. 

      Maternal phospholipids

  • 10. 
    Which of the following structures gives rise to the umbilical arteries and vein?
    • A. 

      The allantois

    • B. 

      The yolk sac

    • C. 

      Chorion

    • D. 

      The chorion frondosum

    • E. 

      Amnion

  • 11. 
    Most drugs taken during early pregnancy are transported across the placental barrier primarily by:
    • A. 

      Phagocytosis

    • B. 

      Simple diffusion

    • C. 

      Facilitated diffusion

    • D. 

      Active transport

    • E. 

      Pinocytosis

  • 12. 
    Which of the following substances DOES NOT cross the placental barrier?
    • A. 

      Cortisol – a steroidal hormone

    • B. 

      Triglycerides

    • C. 

      Amino acids

    • D. 

      Glucose

    • E. 

      IgG

  • 13. 
    Which of the following cell types is involved in the production of placental estrogen?
    • A. 

      Decidua basalis

    • B. 

      Cytotrophoblast cells

    • C. 

      Yolk sac cells

    • D. 

      Extraembryonic somatic mesoderm

    • E. 

      Syncytiotrophoblast