Right atrium and left atrium, Collect blood from the body and lungs., Right ventricle and left ventricle, Pump blood to the lungs and body., Oxygen, A gas that is important for breathing and keeps us alive., Muscles, Help the heart work by contracting and relaxing., Nutrients, Substances in food that help us grow and stay healthy., Lungs, Where oxygen is taken into the blood., Body, The entire system that needs oxygen and nutrients to function.

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