1. Leukocytes (WBCs) Crucial in the body’s defense against disease
These are only complete cells in blood
Diapedesis:

2. Leukocytes (WBCs) Positive Chemotaxis Can move by amoeboid motion
4,000 to 11,000 WBC per cubic millimeter of blood

3. Abnormal numbers of leukocytes
Leukocytosis
WBC count above 11,000 leukocytes/mm3
Generally indicates an infection
Leukopenia
Abnormally low leukocyte level
Commonly caused by certain drugs such as corticosteroids and anticancer agents
Leukemia
Bone marrow becomes cancerous, turns out excess WBC

4. Types of leukocytes Granulocytes
Include neutrophils, eosinophils, and basophils

5. Types of Granulocytes
Agranulocytes
Include lymphocytes and monocytes

6. Formed Elements List of the WBCs from most to least abundant
Neutrophils
Lymphocytes
Monocytes
Eosinophils
Basophils

7. Types of granulocytes Neutrophils
Multilobed nucleus with fine granules

8. Types of granulocytes
Eosinophils
Large brick-red cytoplasmic granules

9. Types of granulocytes
Basophils

11. Types of agranulocytes
Lymphocytes

12. Types of agranulocytes
Monocytes

14. Formed Elements Platelets
Derived from ruptured multinucleate cells (megakaryocytes)
Normal platelet count = 300,000/mm3

15. Formed Elements Hemocytoblast stem cells Secondary stem cells
Basophils
Eosinophils
Neutrophils
Monocytes
Lymphocytes
Erythrocytes
Platelets
Lymphoid stem cells
Myeloid stem cells
Figure 10.4