White blood cells, or ____, function as part of the immune system to react to foreign challenges.

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White blood cells are also known as leukocytes and are a critical component of the body's immune response. Erythrocytes are red blood cells, thrombocytes are platelets involved in blood clotting, and lipoproteins are molecules composed of both lipids and proteins that transport cholesterol in the bloodstream.

White Blood Cells, or ____, Function as Part of the Immune