What is the mean diameter of an erythrocyte?
AAbout 7 to 8 micrometers
BAbout 2 to 4 micrometers
CAbout 12 to 20 micrometers
DAbout 50 to 100 micrometers
Answer & Solution
Correct answer: A. About 7 to 8 micrometers
1. Erythrocytes are small cells with a mean diameter of only about 7 to 8 micrometers.
2. Platelets are smaller still, at about 2 to 4 micrometers.
3. Monocytes, the largest leukocytes, run 12 to 20 micrometers, and megakaryocytes are larger again at 50 to 100 micrometers.
4. The erythrocyte therefore sits between the platelet and the leukocyte in size.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 18 "The Cardiovascular System: Blood", section 18.3 Erythrocytes_
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