Physiology of Blood: Introduction and Red Blood Cells
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Questions and Answers

What enzyme found on RBCs catalyzes the reversible reaction between CO2 and H2O to form carbonic acid?

  • Carbonic anhydrase (correct)
  • Lipase
  • Hemoglobin
  • Amylase
  • What is the major function of red blood cells (RBCs)?

  • To produce hemoglobin for the blood
  • To transport carbon dioxide from lungs to the tissues
  • To act as an acid-base buffer in the blood (correct)
  • To transport oxygen from tissues to the lungs
  • What is the average number of red blood cells per cubic millimeter in normal men?

  • 5,200,000 (±300,000) (correct)
  • 4,700,000 (±300,000)
  • 4,400,000 (±300,000)
  • 6,000,000 (±300,000)
  • What is the average thickness of red blood cells at the thickest point?

    <p>2.5 micrometers</p> Signup and view all the answers

    Where are primitive nucleated red blood cells produced in the early weeks of embryonic life?

    <p>Yolk sac</p> Signup and view all the answers

    Where are RBCs exclusively produced during the last month of gestation and after birth?

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

    At what age does the marrow of long bones stop producing RBCs?

    <p>20 years old</p> Signup and view all the answers

    What type of cell is responsible for forming all the cells of the circulating blood?

    <p>Pluripotential hematopoietic stem cell</p> Signup and view all the answers

    What is the principal stimulus for red blood cell production in low oxygen states?

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

    Where is about 90 per cent of all erythropoietin formed?

    <p>In the kidneys</p> Signup and view all the answers

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