Microbiology

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Lymphocytes

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Microbiology

Definition

Lymphocytes are a type of white blood cell integral to the immune system, primarily involved in adaptive immunity. They include B cells, T cells, and natural killer (NK) cells.

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5 Must Know Facts For Your Next Test

  1. Lymphocytes play a crucial role in hypersensitivity reactions by mediating both immediate and delayed responses.
  2. B cells produce antibodies that can contribute to allergic reactions and autoimmune diseases.
  3. T cells are essential for cell-mediated immunity and are involved in type IV hypersensitivity (delayed-type hypersensitivity).
  4. Natural killer (NK) cells can kill virus-infected cells and tumor cells without prior sensitization.
  5. Dysregulation of lymphocyte function can lead to various hypersensitivities and autoimmune disorders.

Review Questions

  • What roles do B cells and T cells play in hypersensitivity reactions?
  • How do NK cells differ from B and T lymphocytes in their immune function?
  • Describe the involvement of lymphocytes in type IV hypersensitivity.
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