Final answer:
White blood cells are part of the immune system within the circulatory system and defend the body against foreign invaders.
Explanation:
White blood cells are part of the immune system in the circulatory system. They help defend the body against foreign invaders like bacteria and viruses. Examples of white blood cells include neutrophils, monocytes, lymphocytes, eosinophils, and basophils.
Learn more about Circulatory System and Immune System Interaction here:
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