3.  All the cells in your body require oxygen. Without it, they couldn't move, build, reproduce, and turn food into energy.

4.  About 20 times a minute, you breathe in. When you do, you inhale air. 1) The air enters through your NASAL PASSAGE. Here the air is filtered, heated, moistened. Then the air enters the back of the throat.

5. 2) The air goes down through the PHARYNX and passes the LARYNX. 3) After the larynx, the air goes down through the TRACHEA. 4) Your trachea divides into two tubes called the BRONCHIAL TUBES. The bronchial tubes enter your lungs. 5) Inside each of your lungs, the bronchial tubes become smaller tubes (like a tree) 6) At the end of the tubes there are millions of tiny bubble sacs called PULMONARY ALVEOLUS

6. Spread out flat, all the air sacs in the lungs of an adult would cover an area about 1/3 of a tennis court.

7.  7) The aveoli bring new oxygen from air you've breathed to your bloodstream.  The aveoli exchange air for carbon dioxide.  Carbon dioxide is made by the cells in your body

8.  8) The carbon dioxide goes from the aveolus to the mouth when you exhale.

10. The diaphram  The diaphram controls your breathing.  To inhale, the diaphram pulls down  To exhale, the diaphram pushes up

12.  Your lungs contain almost 2414 km of airways and over 300 million alveoli.  Every minute you breathe in 6 liters of air.

15. Why is smoking bad for your lungs?  There is tar in cigarettes. Ths tar stays in your bronchial tubes.  The tar damages the hair in the lungs. So the hair can’t clean the air.  Chemicals in cigarettes attack the bronchial tubes. This causes “smokers cough” and inflamation of the tubes.  Smoking raises blood pressure  Smoking makes heart problems more probable.  Cigaretts have nicotine. Nicotine makes people addicted to smoking, so they want to smoke a lot and can´t stop!

20. Emphysemamphysema  Loss of lung elasticity - When you inhale the lungs expand and contract by the elastic in the walls of the lungs.  When you smoke, the tar damages the elastic.  If you smoke a lot, the elastic doesn’t work, so the lungs cannot contract. This makes it difficult to exhale.

22. What other bad things smoking causes  It can cause these cancers:  Acute myeloid leukemia  Bladder cancer  Cancer of the cervix  Cancer of the esophagus  Kidney cancer  Cancer of the larynx (voice box)  Lung cancer  Cancer of the oral cavity (mouth)  Pancreatic cancer  Cancer of the pharynx (throat)  Stomach cancer

23. Smoking and Pregnancy  If a pregnant woman smokes, these can happen:  preterm delivery  stillbirth  low birth weight  sudden infant death syndrome (SIDS)

24. Increased risk of disease  heart disease by 2 to 4 times  stroke by 2 to 4 times  men developing lung cancer by 23 times  women developing lung cancer by 13 times  dying from chronic obstructive lung diseases (such as chronic bronchitis and emphysema) by 12 to 13 times

25.  Cigarette smoking causes 443,000 deaths, or nearly one of every five deaths, each year in the United States.  More deaths are caused each year by tobacco use than by all deaths from human immunodeficiency virus (HIV), illegal drug use, alcohol use, motor vehicle injuries, suicides, and murders combined.  Smoking causes 90% of all lung cancer deaths in men and 80% of all lung cancer deaths in women