Lymphoid Organs of The Immune System
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Questions and Answers

Where does hematopoiesis occur initially during fetal development?

  • In the thymus
  • In the liver
  • In the bone marrow
  • In the yolk sac (correct)

    • What is the primary function of red bone marrow?

  • Production of red blood cells (correct)
  • Production of white blood cells
  • Maturation of T cells
  • Storage of fat

    • Which organ is responsible for storing fat and certain stem cells?

  • Spleen
  • Liver
  • Bone marrow (correct)
  • Thymus

    • Which organ is NOT classified as a primary lymphoid organ?

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

    What are the two types of bone marrow mentioned in the text?

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

    Where does B cell maturation occur?

    <p>Bone marrow</p> Signup and view all the answers

    Where does hematopoiesis take place mostly by puberty?

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

    What is the red marrow in bones composed of?

    <p>Blood-filled sinusoids and blood cell precursors</p> Signup and view all the answers

    Where do blood cell precursors mature before entering the vascular circulation?

    <p>In the sinusoidal basement membrane</p> Signup and view all the answers

    What happens when there is an exceptional demand for production of new blood cells?

    <p>The liver and spleen become sites of extramedullary hematopoiesis</p> Signup and view all the answers

    What is the function of Hematopoietic Stem Cells (HSCs)?

    <p>They can differentiate into all types of blood cells</p> Signup and view all the answers

    How are HSCs identified?

    <p>By the absence of lineage-specific markers expressed in mature cells</p> Signup and view all the answers

    What roles do Innate Lymphoid Cells (ILCs) play?

    <p>Immune defense against microbes, regulation of adaptive immunity, tissue remodeling, and repair</p> Signup and view all the answers

    What happens to the thymus after puberty?

    <p>It involutes so that it is not detectable in adults</p> Signup and view all the answers

    What is the function of the thymus gland?

    <p>Maturation of T lymphocytes</p> Signup and view all the answers

    What is the composition of red marrow in bones?

    <p>Spongelike reticular framework with a network of blood-filled sinusoids lined by endothelial cells and clusters of blood cell precursors</p> Signup and view all the answers

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