What pools of leukocytes are included in the typical white blood count?
a. All cells inside the blood vessel
b. Only cells freely circulating
c. Only cells marginating against the vessel wall
d. All leukocytes in the body
ANS: B
The clinician performs the white blood cell (WBC) count by counting the number of white cells in blood. However, a pool of granulocytes exists that is marginated (clinging to the sides of small blood vessels). Even though they are still in the blood vessel, these granulocytes are not freely circulating and are not counted. Only freely circulating white cells of all types are counted.
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