In circulating blood, which lymphocyte type is the most abundant?

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Multiple Choice

In circulating blood, which lymphocyte type is the most abundant?

Explanation:
T cells are the most abundant lymphocytes in circulating blood. They make up the majority of lymphocytes, typically around 60–70%, while B cells are a smaller portion (about 10–20%) and NK cells an even smaller portion (roughly 5–15%). Monocytes are not lymphocytes at all; they belong to a different leukocyte lineage and are present in only a small percentage. This distribution reflects the central role of T cells in coordinating adaptive immunity and their continuous recirculation between blood and lymphoid tissues.

T cells are the most abundant lymphocytes in circulating blood. They make up the majority of lymphocytes, typically around 60–70%, while B cells are a smaller portion (about 10–20%) and NK cells an even smaller portion (roughly 5–15%). Monocytes are not lymphocytes at all; they belong to a different leukocyte lineage and are present in only a small percentage. This distribution reflects the central role of T cells in coordinating adaptive immunity and their continuous recirculation between blood and lymphoid tissues.

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