ORGAN SYSTEM - organs that work together are part of an _________, WHITE BLOOD CELLS - cells that help fight infection, CIRCULATORY SYSTEM - Heart, blood vessels, and blood belong to what organ system?, ORGANS - a group of tissues that work together, CELLS - the most basic building units of life., TISSUES - cells that work together are called, BRAIN - control center of the human body, HEART - collects and pumps blood throughout the blood stream in your body., LUNGS - organ that is responsible for respiration, INTESTINES - digest and absorb nutrients from food.,

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