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We lose half a liter of water a day through breathing.

The right lung is slightly larger than the left.

Woman and children breath faster than men.

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A condition in which bronchi swell and contract, constricting the ability to breathe. It can be triggered by many factors such as anxiety, stress, allergies, and exercise.

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To keep the respiratory system healthy you need to not breathe in smoke or do drugs.   Here some other ways:
Improve indoor air
Stay away from pollutants

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There is only one 'pipe' and it is split.  The trachea is one part of the pipe, which carries air to the lungs.  The other is the esophagus, which carries food and water to the stomach.  What usually prevents water and food going down the trachea is the epiglottis.  The epiglottis is a small flap of skin that covers the trachea when eating and drinking but opens when breathing. The water/food goes down the trachea if you are laughing and then swallow water.

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Lungs:  Your lungs are organs in your chest that allow your body to take in oxygen from the air. They also help remove carbon dioxide from your body.

Alveoli: The alveoli are located in the ends of the bronchial tubes. They exchange gasses with the blood.

Trachea: the windpipe.  Carries air into your lungs.

Bronchi: Trachea divides into two directions. These two passages are known as bronchi. The bronchial tree branches off into several smaller tubes that allow the air to fill the lungs.

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The diaphragm pulls down, creating suction, pulling air through the nose or mouth, and into the lungs. When you exhale the same thing happens in reverse, the diaphragm releases and pushes the air back out.

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https://www.nhlbi.nih.gov/health/health-topics/topics/hlw
http://www.smartsign.com/blog/wp-content/uploads/2012/06/DrugsRBad.gif
http://warriors.warren.k12.il.us/dburke/amazingfactsrespiratory.htm
https://www2.estrellamountain.edu/faculty/farabee/biobk/humrespsys_1.gif
http://blogs.discovermagazine.com/d-brief/files/2013/04/nose.jpg
https://www.google.com/search?q=when+water+goes+down+the+wrong+pipe+meme&safe=strict&espv=2&biw=1366&bih=605&source=lnms&tbm=isch&sa=X&ved=0ahUKEwix99m5sP7OAhXDXh4KHTPfBz4Q_AUIBigB#imgrc=wzkn6fSI7ef8vM%3A
https://skylerzarndt.files.wordpress.com/2014/12/diaphragm.jpg
http://blog.adlegant.com/wp-content/uploads/2014/01/polls_very_interesting_3518_142823_answer_1_xlarge.jpeg
http://www.top10homeremedies.com/wp-content/uploads/2012/11/asthma-big-ft.jpg
http://choirly.com/wp-content/uploads/2012/04/breathing-with-the-diaphragm.jpg

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Breathing is a complicated thing for your body to do.  The first part of breathing in is when small hairs in your nose filter out particles.  These hairs are called cilia.  The second part is when blood vessels in your nose warm the air coming in. The third part is when mucous membrane moistens the air before it goes into your body.

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Pharynx: When air enters through the mouth, it first goes through the pharynx. This is another word for part of your throat.

Nose:  also takes in air.

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The Respiratory System's job is to deliver oxygen to the body, filter air, and control air temperature.
The Respiratory System is compiled of two things:
The upper tract is the nose and the throat.
The lower tract consists of the lungs.