Essentials of Anatomy and Physiology

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Macrophage

Plasma cell

T cell

Monocyte

Thrombocytes

(platelets)

Stem cell Lymphoblast

B cell

Natural

killer

cell

Eosinophil

Megakaryocyte

Normoblasts

Reticulocytes

Erythrocytes

Basophil

Neutrophil

Band cell

Figure 11–2. Production of blood cells. Stem cells are found primarily in red bone mar-

row and are the precursor cells for all the types of blood cells.

QUESTION:Where are normoblasts and reticulocytes usually found, and why?