each system in your body has many parts working together, Blood carries oxygen throughout your body., Jodi's heart beat quickly as she ran up the stairs., Arthur eats low-fat food to keep his arteries healthy., Sasha could see tiny blue veins under skin., A capillary is smaller than an artery or vein., Andy's lungs fill up with air quickly when he runs., Your trachea lets air into you lungs., The baby's diaphragm moved in and out as she slept., We breathe carbon dioxide out of our mouths., Peter could feel his pulse in his wrist.

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