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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