a group of parts that work together to achieve a specific purpose., system, the two organs in our chest that help us breathe by taking in oxygen and removing carbon dioxide., lungs, a red liquid that circulates in our body, carrying oxygen and nutrients to our cells., blood, is a tube that connects the throat to the lungs, allowing air to pass through., trachea, a muscle that pumps blood throughout the body, supplying oxygen and nutrients to the organs., heart, a muscle located below the lungs that helps us breathe by changing the pressure in the chest., diaphragm, blood vessels that carry oxygen-rich blood away from the heart to the rest of the body., arteries, are blood vessels that carry oxygen-poor blood back to the heart., veins, a waste gas produced by our bodies when we use oxygen. We breathe it out., Carbon Dioxide, tiny blood vessels that connect arteries and veins, allowing for the exchange of oxygen, nutrients, and waste., cappilary, the rhythmic beat of the heart that can be felt in certain areas of the body, showing how fast the heart is beating., pulse.
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