White blood cells primarily involved in immune defense, including phagocytosis?

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White blood cells, or leucocytes, are the body's defenders against infection. Among them, certain cells such as neutrophils and macrophages perform phagocytosis, which is the process of engulfing and digesting invading microbes. This makes leucocytes the key players in immune defense and phagocytosis.

Erythrocytes (red blood cells) mainly carry oxygen and carbon dioxide; platelets are involved in blood clotting and wound repair; arteries are blood vessels that carry blood away from the heart. These distinctions show why leucocytes are the correct choice for involvement in immune defense and phagocytosis.