White blood cells are circulated by the cardiovascular system.However,they play an important part in defending against infection; thus,white blood cells are part of the body's _____ system.

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Quizplus · Accepted Answer

White blood cells are part of the immune system, as they are responsible for defending against infections and foreign substances. The respiratory system involves breathing and the exchange of gases such as oxygen and carbon dioxide, while the endocrine system involves the production and regulation of hormones. The limbic system is responsible for emotional and behavioral responses.

White Blood Cells Are Circulated by the Cardiovascular System