Part 1: The cardiovascular system (the heart and blood vessels) is the most vitally important organ system in the body. Your heart pumps blood, and your blood vessels channel and deliver nutrient-rich oxygenated blood throughout your body.
Up Next in Body of Evidence
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Cardiovascular System (Heart) 2
Part 2: The cardiovascular system (the heart and blood vessels) is the most vitally important organ system in the body. Your heart pumps blood, and your blood vessels channel and deliver nutrient-rich oxygenated blood throughout your body.
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Respiratory System (Lungs) 1
Part 1: The human respiratory system—of which the lungs are the largest component—is the most high-tech air purification and conditioning system on earth.
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Respiratory System (Lungs) 2
Part 2: The human respiratory system—of which the lungs are the largest component—is the most high-tech air purification and conditioning system on earth.
