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Microbiology, 2021

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702 17 • Innate Nonspecific Host Defenses<br />

Figure 17.13<br />

Granulocytes<br />

Formed elements of blood include erythrocytes (red blood cells), leukocytes (white blood cells), and platelets.<br />

The various types of granulocytes can be distinguished from one another in a blood smear by the appearance<br />

of their nuclei and the contents of their granules, which confer different traits, functions, and staining<br />

properties. The neutrophils, also called polymorphonuclear neutrophils (PMNs), have a nucleus with three<br />

to five lobes and small, numerous, lilac-colored granules. Each lobe of the nucleus is connected by a thin<br />

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