White Blood Cells Quiz
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White Blood Cells Quiz

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@ExcitingPrehistoricArt1767

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Questions and Answers

What is the approximate range of white blood cells in a microliter of blood?

  • 5000 to 10000 (correct)
  • 2000 to 4000
  • 15000 to 20000
  • 10000 to 15000

    • Which type of white blood cell is the most abundant?

  • Neutrophils (correct)
  • Eosinophils
  • Lymphocytes
  • Basophils

    • What role do neutrophils play in the immune response?

  • Producing antibodies
  • Secreting histamines
  • Maturing into macrophages
  • Engulfing and digesting foreign materials (correct)

    • What is a significant characteristic of granulocytes?

    <p>They have obvious granules.</p> Signup and view all the answers

    Where are eosinophils typically found in the body?

    <p>In the lining of the respiratory and digestive tract</p> Signup and view all the answers

    What are white blood cells also known as?

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

    What is notable about the quantity of white blood cells in the blood?

    <p>They are the fewest of the formed elements.</p> Signup and view all the answers

    Which statement about white blood cells is incorrect?

    <p>They assist in blood clotting.</p> Signup and view all the answers

    Which of the following is a function of white blood cells?

    <p>Defending against infections</p> Signup and view all the answers

    Which characteristic distinguishes white blood cells from red blood cells?

    <p>Role in immune defense</p> Signup and view all the answers

    What is the lifespan of monocytes after transforming into macrophages in tissues?

    <p>A few years</p> Signup and view all the answers

    Which of the following statements about monocytes is accurate?

    <p>They are highly phagocytic and can engulf large infected cells.</p> Signup and view all the answers

    What does a complete blood cell count (CBC) provide information about?

    <p>All the formed elements of the blood</p> Signup and view all the answers

    What is leukemia primarily characterized by?

    <p>An extremely high white blood cell count</p> Signup and view all the answers

    After how long do monocytes migrate from the bloodstream into tissues?

    <p>10 to 20 hours</p> Signup and view all the answers

    What is one of the primary functions of basophils?

    <p>They are involved in allergic reactions and kill parasites.</p> Signup and view all the answers

    Which of the following statements about lymphocytes is true?

    <p>They migrate to the thymus to finish maturing.</p> Signup and view all the answers

    What substance do basophils secrete to attract other white blood cells?

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

    Which of the following describes agranulocytes?

    <p>They lack cytoplasmic granules.</p> Signup and view all the answers

    How long can lymphocytes survive?

    <p>Up to a few decades</p> Signup and view all the answers

    Study Notes

    White Blood Cells (WBCs)

    • White blood cells (WBCs) or leukocytes are essential for fighting infection and are the body's line of defense.
    • A microliter of blood contains between 5,000 and 10,000 white blood cells (WBCs).
    • There are five types of WBCs, each with unique size, appearance, abundance, and function.
    • All leukocytes have a nucleus and other internal structures, some appearing as granules under a microscope.

    Granulocytes

    • Granulocytes contain obvious granules.
    • Neutrophils: The most abundant WBCs, highly mobile and rapidly migrate to tissues to engulf and digest foreign materials.
    • Eosinophils: Are numerous in the lining of the respiratory and digestive tracts.
    • Basophils: Involved in allergic reactions and killing parasites.

    Basophils

    • Limited phagocytic ability.
    • Secrete heparin (an anticoagulant) preventing clotting in infected areas to allow WBCs to enter.
    • Secrete histamine, attracting WBCs by causing blood vessel leaking.

    Agranulocytes

    • Agranulocytes lack cytoplasmic granules.
    • Two types: Lymphocytes and Monocytes.

    Lymphocytes

    • The second most abundant WBCs and the smallest.
    • Responsible for long-term immunity.
    • T lymphocytes directly attack infected or cancerous cells.
    • B lymphocytes produce antibodies against specific antigens.
    • All lymphocytes originate in the bone marrow, some mature there, while others migrate to the thymus for development.
    • Mature lymphocytes colonize lymph system organs and tissues such as the spleen and lymph nodes.
    • Continuously cycle between the bloodstream and lymph system.
    • Can survive for weeks to decades.

    Monocytes

    • The largest WBCs.
    • Highly phagocytic and can engulf large bacteria and viral infected cells.
    • After circulating for 10-20 hours, monocytes migrate into tissues and transform into macrophages.
    • Macrophages aggressively phagocytize bacteria, cellular debris, and cancerous cells.
    • Can live for years.

    CBC

    • The complete blood cell count (CBC) is the most common blood test performed.
    • Provides information about all formed elements of the blood: red blood cells (RBCs), including hemoglobin, WBCs, and platelets.

    Leukemia

    • A cancer of blood or bone marrow characterized by an extremely high WBC count.

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    Description

    Test your knowledge on white blood cells and their functions! This quiz covers the types of WBCs, their characteristics, and roles in the immune system. Learn about granulocytes, including neutrophils, eosinophils, and basophils.

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