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Types of Leukocytes in Anatomy & Physiology

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  • What are leukocytes?

    Leukocytes are white blood cells involved in the body's immune response.

  • Name the two main categories of leukocytes.

    Granulocytes and agranulocytes.

  • What are granulocytes?

    Leukocytes with visible granules in their cytoplasm, including neutrophils, eosinophils, and basophils.

  • What are agranulocytes?

    Leukocytes without visible granules, including lymphocytes and monocytes.

  • Function of neutrophils

    Neutrophils are the most abundant leukocytes and act as first responders to bacterial infection by phagocytosis.

  • Role of eosinophils

    Eosinophils combat parasitic infections and participate in allergic reactions.

  • Function of basophils

    Basophils release histamine and other chemicals during inflammatory and allergic responses.

  • What do lymphocytes do?

    Lymphocytes are key in adaptive immunity, including B cells, T cells, and natural killer cells.

  • Role of monocytes

    Monocytes differentiate into macrophages and dendritic cells to phagocytize pathogens and present antigens.

  • Which leukocyte is the most abundant?

    Neutrophils are the most abundant type of leukocytes in the blood.

  • Which leukocytes are involved in allergic reactions?

    Eosinophils and basophils play major roles in allergic responses.

  • Which leukocytes are part of the adaptive immune system?

    Lymphocytes (B cells and T cells) are central to adaptive immunity.

  • What is the primary function of macrophages derived from monocytes?

    To phagocytize pathogens and dead cells and present antigens to lymphocytes.

  • How do basophils contribute to inflammation?

    By releasing histamine and other mediators that increase blood vessel permeability.

  • Which leukocyte type is involved in fighting parasitic worms?

    Eosinophils target parasitic worms and modulate allergic inflammation.

  • What distinguishes granulocytes from agranulocytes microscopically?

    Granulocytes have visible cytoplasmic granules; agranulocytes do not.

  • Which leukocytes can differentiate into dendritic cells?

    Monocytes can differentiate into dendritic cells for antigen presentation.

  • What is the lifespan of neutrophils?

    Neutrophils typically live for a few hours to a few days in tissues.

  • Which leukocytes are involved in immune memory?

    Memory B cells and memory T cells provide long-term immunity.

  • What is the main function of natural killer (NK) cells?

    NK cells destroy virus-infected and tumor cells without prior sensitization.