Where does this come from, and can I check it?

Leukocytes circulate in blood and tissue to destroy invading bacteria and viruses. The figure is taken from NIH, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

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Yes. It sits on the Human Body shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.

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The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.

Mondo Knows Facts

White blood cells defend the body against infectious pathogens

Leukocytes circulate in blood and tissue to destroy invading bacteria and viruses

White blood cells or leukocytes make up about one percent of blood volume but form the core of the immune system. Neutrophils, lymphocytes, and macrophages target, engulf, and destroy foreign pathogens or produce antibodies to neutralise specific viral infections.

Red blood cells (RBCs), platelets and white blood cells or leukocyte (neutrophil) on PBS — Ajay Kumar Chaurasiya · CC BY-SA 4.0 · licence · source

Where this comes from

NIH

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Tags: blood, immunity, cells

White blood cells defend the body against infectious pathogens: the short answers

Where does this come from, and can I check it?: Leukocytes circulate in blood and tissue to destroy invading bacteria and viruses. The figure is taken from NIH, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a human body fact?: Yes. It sits on the Human Body shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.