fun+facts

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 * = There are 300 million alveo **li in a pair of human lungs** =
 * = Approximately, 1500 miles of airways are present in human lungs. =
 * = In human beings the right lung is larger than left lung for more comfort of the heart. =
 * = We yawn because the brain detects low levels of oxygen in our lungs, so it sends a message to tell the lungs to take in more air. We don't always yawn for that reason. =
 * = Most people breathe 6 litres of air every minute. =
 * = We can have hiccups by the sudden move of the diaphgrm when it is irritated. You get hiccups when you eat to quickly or to much when you eel nervous or exited,or when you feel an irritation in the stomach or throat. Hiccups only stay as long as some minutes. =
 * = The Guinness World Records lists that Charles Osborne of Anthon, Iowa was the man that had hiccups for a very long time. He hiccuped for 68 years. =
 * = [[image:science_respiratory_system_chart-1.gif width="387" height="343"]] =
 * = Did you know that sneezing is a very complicated and difficult process because the nose gets tickled. After that the brain gets a signal in a speacial part called sneeze center. The brain sends a signal to al the muscles that are used to sneeze. They are the abdominal,chest, the diaphragm,muscles that control your vocal cords and the ones in the back of your throat. =
 * = Every time you sneeze you close your eyes because if not they would pop out. =
 * = There are some people that sneez when they are exposed to the sun. =
 * = The humans sneez travels very fast.The fasted record sneeze is 190 kms per hour in speed. =
 * = When you cough droplets of water with germs and things you don't want, can travel up to 1 metre. Thats way people say cover up your mouth when you are coughing. =
 * = If flatten out a lung it would mesure the size of a tennis court! =
 * = a cigarette cuts 5 minutes of your life. In that amount of time you finish smoking a cigarette =
 * = A normal person breathes in about 44 pounds of dust in their lifes. =
 * = Both of our nostrlis smelll diffrently. Our right nostril smells more pleasant than the left. =
 * = When we rest we breathe 16 to 14 times per minute. After exercise we breathe about 60 times per minute. =
 * = The lungs are the only organs in our body that can float in water =
 * = Every day while we breathe we are losing half a liter of water. =
 * = we have 12 pairs of ribs, snakes have 200 pairs. =

Here is a game that will teach where some of the most mportant parts of almost all the systems in our body are: http://sciencenetlinks.com/interactives/systems.html