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Grade 5
Topic Cloze Quiz
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A Breathing System
If you concentrate, you can control your breathing
tanks
muscles
air
photosynthesis
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. They’re controlled automatically when your
muscles
plants
brain
lungs
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senses carbon dioxide in your blood. If this builds up, you
yawn
photosynthesis
air
tanks
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or take a deep breath. You breathe hard after running because your
brain
muscles
lungs
tanks
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can’t take in oxygen quickly enough. Mountain climbers need to carry oxygen
lungs
photosynthesis
tanks
plants
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because the higher you climb the thinner the
lungs
brain
air
plants
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gets. We don’t run out of oxygen because
plants
tanks
lungs
muscles
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release it in a process called
air
brain
photosynthesis
carbon dioxide
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. Plants also help by taking in and using
plants
carbon dioxide
photosynthesis
air
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from the air.