Leukocytes

Okay, I admit, this actually falls under the blood category, but there's a decent amount of information to know on leukocytes, so they get to have their own page!

• There are 5 kinds of leukocytes (WBCs)-neutrophils, eosinophils, basophils, lymphocytes, and monocytes.

Type of Leukocyte	Photo
Neutrophils- 60-70% of all WBCs. 10-12 um in diameter Nucleus has 2-5 lobes Cytoplasm has fine, lilac granules. Function: Phagocytosis
Eosinophils- 2-4% of all WBCs 10-12 um in diameter Nucleus has 2-3 lobes Large, red-orange granules in the cytoplasm. Function: Combats allergic reactions, phagocytizes antigen-antibody complexes, and destroys some parasitic worms.
Basophils- 0.5-1.0% of all WBCs 8-10 um in diameter Nucleus has 2 lobes Large, blue-purple granules in the cytoplasm. Function: Liberates heparin,  histamine, and serotonin in allergic reactions that intensity the overall inflammatory response.
Lymphocytes- 20-25% of all WBCs May be 6-14 um in diameter. Nucleus is round or slightly indented. Cytoplasm forms a rim around the nucleus that looks sky blue. Functions: B-cells secrete antibodies, T-cells attack invading viruses, and natural killer cells attack infectious microbes and tumor cells.
Monocytes- 3-8% of all WBCs 12-20 um diameter Nucleus is kidney or horseshoe shaped. Cytoplasm is blue-gray with foamy appearance. Function: Phagocytosis, after transforming into fixed or wandering macrophages.