Final answer:
The normal leukocyte count in healthy adults is typically 5,000 to 10,000 cells per µL of blood, serving important functions in the immune system.
Step-by-step explanation:
In healthy adults, the approximate normal range for leukocytes, also known as white blood cells (WBC), is 5,000 to 10,000 cells per cubic millimeter (µL) of blood. These cells are crucial for the body's immune system, protecting against invading microorganisms and cleaning up debris. Leukocytes are less numerous in the blood compared to red blood cells, but they perform essential functions for bodily defense and repair.