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Alberts B, Johnson A, Lewis J, et al. Molecular Biology of the Cell. 4th edition. New York: Garland Science; 2002.

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Molecular Biology of the Cell. 4th edition.

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Table 22-1Blood Cells

TYPE OF CELLMAIN FUNCTIONSTYPICAL CONCENTRATION IN HUMAN BLOOD (CELLS/LITER)
Red blood cells (erythrocytes) transport O2 and CO2 5 × 1012
White blood cells (leucocytes)
 Granulocytes
  Neutrophils (polymorphonuclear leucocytes)phagocytose and destroy invading bacteria5 × 109
  Eosinophilsdestroy larger parasites and modulate allergic inflammatory responses2 × 108
  Basophilsrelease histamine (and in some species serotonin) in certain immune reactions4 × 107
 Monocytes become tissue macrophages, which phagocytose and digest invading microorganisms and foreign bodies as well as damaged senescent cells4 × 108
 Lymphocytes
  B cellsmake antibodies2 × 109
  T cellskill virus-infected cells and regulate activities of other leucocytes1 × 109
 Natural killer (NK) cells kill virus-infected cells and some tumor cells1 × 108
Platelets (cell fragments arising from megakaryocytes in bone marrow)initiate blood clotting3 × 1011

Humans contain about 5 liters of blood, accounting for 7% of body weight. Red blood cells constitute about 45% of this volume and white blood cells about 1%, the rest being the liquid blood plasma.

From: Renewal by Multipotent Stem Cells: Blood Cell Formation

Copyright © 2002, Bruce Alberts, Alexander Johnson, Julian Lewis, Martin Raff, Keith Roberts, and Peter Walter; Copyright © 1983, 1989, 1994, Bruce Alberts, Dennis Bray, Julian Lewis, Martin Raff, Keith Roberts, and James D. Watson .

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