1. Monocyte

Two to three times larger than a red blood cell; nuclear shape varies from spherical to lobed

3%-9% of white blood cells present

Phagocytizes large particles

2. Lymphocyte

Only slightly larger than a red blood cell; its nucleus nearly fills cell

25%-33% of white blood cells present

Provides immunity

Platelet (thrombocyte)

Cytoplasmic fragment

130,000 to 360,000 per mm3

Helps control blood loss from broken vessels

mixture of organic and inorganic biochemicals. Functions of plasma constituents include transporting nutrients, gases, and vitamins; helping to regulate fluid and electrolyte balance; and maintaining a favorable pH. Figure 14.16 shows the chemical makeup of plasma.

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