Breathing and the Lungs! Crossword Puzzle

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QUESTIONS LIST:

nitrogen : which is the most present gas in air?
alveoli : what are at the end of every bronchiole?
left : which lung is smaller?
nicotine : what is the addictive and harmful chemical in tobacco products?
ribs : what bones help protect the lungs?
respiratory system : what is the system of body parts that allow you to breathe?
trachea : what is the air pipe called?
black : what colour do your lungs turn if you have been smoking?
oxygen : what gas does breathing allow the body to take in?
diaphragm : what helps the lungs expand and contract?
inter costal : what is the name of the muscles that expand your ribs?
heart : what makes one of your lungs smaller?
diffusion : what is the name of the process where a substance moves from a high concentration of itself to a low one?
true : true or false, lungs can float in water?
tar : what substance narrows bronchioles?