The lungs and respiratory system allow us to ____. They bring oxygen into our bodies (____) and send carbon dioxide out (____). This exchange of oxygen and carbon dioxide is called ____. The respiratory system includes the nose, mouth, throat, voice box, ____ and lungs. The ____ in our bodies need ____ to stay alive. Carbon dioxide is made in our ____ as cells do their jobs. The cardio-respiratory system works together. For example, when a person exercises their heart rate ____ –this increases the rate that oxygen is moved from the blood to the working muscles and carbon dioxide is moved from the working muscles to the ____.

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