alleryStart learning →Roughly what share of the T and B lymphocytes circulating in human blood are T cells?
AAbout 10 to 20 percent
BAbout 40 to 50 percent
CAbout 80 to 90 percent
DAbout 99 to 100 percent
Answer & Solution
Correct answer: C. About 80 to 90 percent
1. Lymphocytes in human circulating blood are approximately 80 to 90 percent T cells.
2. The remaining 10 to 20 percent of circulating lymphocytes are B cells.
3. T cells are involved in the cell-mediated immune response, while B cells are part of the humoral immune response.
4. 10 to 20 percent is instead the figure given for B cells, not T cells, and 40 to 50 percent and 99 to 100 percent do not appear anywhere in this figure.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 42 "The Immune System", section T and B Lymphocytes_
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