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

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

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

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

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

Where are most of the thrombocytes stored in the body?

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

What is the primary site for the production of erythropoietin?

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

What is the function of erythropoietin?

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

What is the role of reticulocytes in erythropoiesis?

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

What is the lifespan of erythropoietin in the plasma?

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

What does an elevated retic count indicate?

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

Which organ releases erythropoietin in response to low renal oxygenation?

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

What does an elevated erythropoietin level indicate?

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

What is the primary function of reticulocytes?

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