cells need oxygen

- breathing in air, body circulates through the blood

- inhaled air goes through the nasal passages

- in nasal passages the air is filtered, heated, moistened and enters the back of the esophagus

- air goes down the wind pipe passed the voice box (larynx), to the lower ribs at the center of your chest

- the wind pipe splits into two tubes called bronchi

- the bronchi lead to the lungs

- the lungs are like sponges they have millions of bubbles called alveoli

- major organs are lungs, wind pipe and the diaphragm

- main job is to get more oxygen on the cells

- alveoli, when the new air has made it there, they exchange the oxygen for the carbon dioxide in the red blood cells and that is how the oxygen gets to the rest of the body

- the carbon dioxide then travels back out your lungs and back up your wind pipe and out when you exhale

- lungs are divided into lobes, the right lung has three lobes, the left lung has two lobes

the parts and functions:

Sinuses: regulates the temperature and humidity of the air

Nasal cavity (nose): the entrance for outside air the hairs clean the air

Oral cavity (mouth): it aids in breathing when the nasal cavity is blocked

Adenoids: it filters the air of germs

Pharynx (throat): collects air from the nose passing it down the trachea (wind pipe)

Epiglottis: a flap of tissue that protects food from entering the Trachea (wind pipe)

Trachea (wind pipe): it leads from the Pharynx to the lungs

Ribs: the ribs do not just protect the organs it also helps the lungs expand and contract

Bronchi: the tubes that the trachea divides into, there are two, one to each lung, these divide even more into even more tubes (in the lungs)

Pleura: protective lining between the lungs and the ribs

Cilia: gets rid of germs from the lungs it lines the bronchial

Diaphragm: controls when to inhale and expand the lungs

Alveoli: bags that exchange carbon dioxide for oxygen

Interesting facts:

- 1500 miles of airways

- 300 million alveoli

- each minute breathe 13 pints of air

- the amount of oxygen a person under 30 consumes is double when against a 80 year old person

- you breathe 20 times a minute

- you can not swim with a snorkel a foot below water because the chest can't expand

- people who live in the mountain have lager chests, and more red blood cells in order to get enough oxygen

Respiratory system diseases:

- some of the common diseases in the respiratory system are common cold, flu, more serious but still common diseases are pneumonia, bronchitis,legionnaires disease,
TB (tuberculosis) and polio
- smokers run the risk of lung cancer and emphysema
- asthma and allergies(hay fever) as well as air pollution effect a persons breathing
- smoking kills the cilia in lungs and you can't cough up soot and mucus from lung

Common Cold : viral infection in the respiratory system
Flu : more sever than the cold but has fever and can cause infections in lungs
Pneumonia : serious lung infection filling the lung with fluid
Bronchitis : inflammation of the bronchi
Legionnaires Disease : caused by breathing bacteria, often from the air conditioning
TB (tuberculosis) : bacterial infection causes scars and damage in lungs
Polio : bacterial infection causing the muscles not to breathe in and out
Emphysema: break down of lung tissue
Air pollution: can be many things, car exhaust, smog, mold, and gases