alleryStart learning →How many leukocytes are normally present per microliter of blood?
AAbout 1000 to 2000
BAbout 50,000 to 100,000
CAbout 5000 to 10,000
DAbout 500 to 1500
Answer & Solution
Correct answer: C. About 5000 to 10,000
1. Leukocytes are far less numerous than erythrocytes.
2. Typically there are only 5000 to 10,000 per microlitre of blood.
3. Erythrocytes run at roughly 5 million per microlitre, so leukocytes are outnumbered by about a thousand to one.
4. That ratio is why a single drop of blood is described as holding millions of red cells but only thousands of white cells.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 18 "The Cardiovascular System: Blood", section 18.4 Leukocytes and Platelets_
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