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Low White Blood Cell Count (Neutropenia) White blood cells fight infection. A normal white blood cell count is between 5,000 and 10,000 cells. A white blood cell count below 1,000 cells increases the risk of infection.

The normal number of WBCs in the blood is 4,500 to 11,000 WBC per microliter (4.5 to multiplied by 109/L). Normal value ranges may vary slightly among different labs. Some labs use different measurements or may test different specimens.

Causes of an elevated white blood cell count include infection, abnormalities in the bone marrow, harmful inhalants, chronic lung disease, immune disorders, inflammatory or allergic reactions or even physical and emotional stress.

The CNS has two kinds of tissue: grey matter and white matter, Grey matter, which has a pinkish-grey color in the living brain, contains the cell bodies, dendrites and axon terminals of neurons, so it is where all synapses are. White matter is made of axons connecting different parts of grey matter to each other.