Question 25 pts
The air travels down the trachea into two branching tubes called __ and then on into the __. At the __ , oxygen from the air enters the __. At the same time, the waste gas, __ , leaves the blood and then leaves the body when you ___. Some __ also leaves the body when you exhale, which is why mirrors get foggy when you breathe on them. The __ is the primary muscle that controls the lungs. It is important to keep the respiratory system clear so oxygen can keep flowing into your body. If something gets in your nose and irritates it, you __. If something gets in your trachea or bronchi and irritates it, you __.

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