Hematologic System
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Questions and Answers

What is the primary site of residence of hematopoietic stem cells in humans?

  • Liver
  • Red bone marrow (correct)
  • Spleen
  • Yellow bone marrow
  • Which type of blood cells are mainly produced in the red bone marrow?

  • White blood cells
  • Platelets
  • Plasma cells
  • Red blood cells (correct)
  • What is the approximate lifespan of erythrocytes in full-term infants?

  • 60-80 days (correct)
  • 90-100 days
  • 10-20 days
  • 30-40 days
  • What is the primary factor leading to polycythemia in newborns?

    <p>Increased erythropoietin production due to hypoxic intrauterine environment</p> Signup and view all the answers

    Which blood cell count is high at birth, then falls within or below normal adult range after 2 weeks?

    <p>Neutrophil count</p> Signup and view all the answers

    What is the main cause of differences in clotting factors between children and adults?

    <p>Decreased risk for thrombotic diseases and complications in children</p> Signup and view all the answers

    Which type of blood cell count is higher in children than in teenagers or adults?

    <p>Eosinophil count</p> Signup and view all the answers

    'Hematopoiesis' is the process of blood cell production primarily occurring in which organ?

    <p>Red bone marrow</p> Signup and view all the answers

    What stimulates the faster differentiation (maturing) of progenitor cells in hematopoiesis?

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

    Where are most of the thrombocytes stored in the body?

    <p>Peripheral blood</p> Signup and view all the answers

    What is the primary site for the production of erythropoietin?

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

    What is the function of erythropoietin?

    <p>Increases RBC number within 24h</p> Signup and view all the answers

    What is the role of reticulocytes in erythropoiesis?

    <p>Contain polyribosomes and mitochondria for hemoglobin synthesis</p> Signup and view all the answers

    What factor increases hematopoiesis by stimulating faster proliferation (dividing) of stem cells into progenitor cells?

    <p>Conversion of yellow bone marrow to red marrow</p> Signup and view all the answers

    Where are matured blood cells stored before being released into the peripheral blood?

    <p>In walls around blood vessels</p> Signup and view all the answers

    What is the lifespan of erythropoietin in the plasma?

    <p>$4-12h$</p> Signup and view all the answers

    What does an elevated retic count indicate?

    <p>New RBCs are being produced</p> Signup and view all the answers

    Which organ releases erythropoietin in response to low renal oxygenation?

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

    What does an elevated erythropoietin level indicate?

    <p>Low renal oxygenation</p> Signup and view all the answers

    What is the primary function of reticulocytes?

    <p>Contain polyribosomes and mitochondria for hemoglobin synthesis</p> Signup and view all the answers

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