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Monocytes are phagocytes that "evolve" or "differentiate" into macrophages. I read that there are monocytes in the blood stream and vessels and that macrophages are found mainly in other tissues and in the lymphatic system.

My question: are there macrophages (and not merely monocytes) in the blood vessels and within the blood stream? And if there are, are they numerous there or sparse?

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Macrophages are white blood cells and I’m pretty sure that leukocytes are present in blood that flows throughout the body and hence they are found in tissues. Typically, more number of macrophages are present in the blood when there is some form of invasion by bacteria or virus.

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    $\begingroup$ This answer is less specific than the question (leukocytes vs. macrophages). $\endgroup$ – R Stephan Jul 11 '18 at 5:43

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