White Blood Cells (Leukocytes) - P2

Blodd Cell Lineage
Blood Cell Lineage
Monocytes mature into macrophages, another type of phagocytic white blood cell that engulfs and destroys invaders such as bacteria, fungi, and dust, as well as disposing of cells of the body that have died.
Sources and Helpful Immunology Links
  • Bauman, R. (2007) Microbiology with Diseases & Taxonomy. Pearson Benjamin Cummings.
  • Becker, W., Kleinsmith, L., Herdin, J., Bertoni, G. P. (2009) The World of the Cell, Seventh Edition. Pearson Benjamin Cummings.
  • White Blood Cells interactive animation and quiz from Wisc-Online interactive animation and quiz from Wisc-Online
Agranulocyte White Blood Cells
Agranulocytes are white blood cells that do not show granules in their cytoplasm when stained. There are two types of agranulocytes:
  • monocytes
  • lymphocytes
Monocyte Agranulocyte White Blood Cell
Lymphocyte Agranulocyte White Blood Cell
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Does the automatic dishwasher sanitize dishes? Yes! 

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Endomembrane System of a Eukaryotic Cell, Mariana Ruiz
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Lymphocytes are white blood cells that, in addition to being involved in the nonspecific, innate immunity we are born with, are also involved in specific immunity, the aspect of immune function that is acquired over time and exposure to the environment. 

Lymphocytes include:
  • NK cells (natural killer cells) of nonspecific immunity that can extracellularly kill virally infected cells and other abnormal body cells by secreting toxins.


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  • Helper T cells assist in regulating the activity of both killer T and B cells.

  • ​Cytotoxic Killer T cells are able to trigger death of infected somatic or tumor cells.

  • B cells are lymphocytes that either secrete specific antibodies in response to an invading antigenic particle (plasma cells) or that remember invaders so that plasma cells can respond to invasion by the same pathogen more quickly if it is encountered again in the future (memory cells).

Single human lymphocytes viewed with scanning electron microscope
Single human lymphocytes viewed with scanning electron microscope.
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