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The human body is a complex and dynamic system that relies on various processes to maintain its homeostasis. The immune system plays a crucial role in this process by protecting against foreign invaders, such as bacteria, viruses, and other pathogens. This protection is made possible through the action of white blood cells, which are produced in the bone marrow and circulate throughout the body via the bloodstream. These cells have various functions, including engulfing and destroying foreign particles.