1) When we breathe in, we take in the _____ that our body needs from the air. a) oxygen b) carbon dioxide 2) When we breathe out, we expel the _____ that our body does not need. a) oxygen b) carbon dioxide 3) We breathe oxygen in through our _______ a) nose and mouth b) tongue 4) Oxygen from the air passes from the respiratory system into the _________ and the blood carries it to all the parts of the body. a) circulatory system b) digestive system 5) We breathe out _______ and oxygen through our nose and mouth. a) carbon dioxide b) 6) Under the lungs there is a big muscle called the __________ which helps us breathe. a) diaphragm b) trachea

Respiratory system

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