carries oxygen, red blood cells, fights infection, white blood cells, clots the blood, platelets, th liquid part that transports blood, plasma, what do arteries do, carries blooed away from the heart, what do veins do, carries blood toward the heart, the 2 upper chambers in the heart, left atrium right atrium, 2 lower chambers of the heart, left ventricle right ventricle, why does heart rate increase with exercise, need more oxygen, the mouth, used for exhalation

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