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Respiratory System
   
Muscle Man by GreenFlames09 on Flickr

Respiratory System is all the organs, muscles and tissues that  help you inhale oxygen and exhale carbon dioxide. 

The respiratory system works with the circulatory system to transport gases throughout the body to the lungs.  
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DIgestive Tract Model Chart (9) by GreenFlames09 on Flickr

  • Respiratory System starts with the Mouth or the Nose. 
  • The nasal cavity is lined with cilia, mucous membranes and blood capillaries.
  • Air is filtered by cilia, moistened by the mucous membranes and warmed by the blood.
  • The oxygen enters the mouth or the nose and moves to the Pharynx. 
  • The Pharynx is the  medical way of saying throat. 
  • The Pharynx connects the nose to the larynx.
  • After the oxygen passes through the Pharynx, it enters the Larynx or the Voice Box.
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mites in a bee's trachea by kat m research on Flickr

  • The Larynx connects the lower part of the Pharynx with the Trachea.
  • The Trachea is the wind pipe that connects the Larynx to the Bronchi.
  • Bronchi is the main tube that runs from the Trachea to the Bronchioles. They also divide into secondary and tertiary bronchi.
  • Bronchioles are made of smooth muscles and the tertiary bronchus lead into the lungs.
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Project 365 #327: 231110 My Radar Sends Me Danger... by comedy_nose on Flickr

  • Lungs are the main organs involved in respiration and ventilation. 
  • Human body has two Lungs - Left and Right Lung. Left one is smaller than the right one because it has to create room for the heart. 2/3 of the heart is located on the left side of the body.
  • The lungs are located in the cavity of the chest.
  • The Alveoli are the air sacs in the lungs where gas exchange takes place.

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Balloon shooting on the beach! by VinothChandar on Flickr

  • When we inhale, our diaphragm pulls down to help pull air into our lungs. 
  • When we exhale, the diaphragm relaxes and air flows out of the lungs back out through the nose and mouth.
  • Sometimes the diaphragm becomes irritated. When this happens, it pulls down in a jerky way, which makes us suck air into our throat suddenly. When the air rushing in hits our voice box, we are left with a big hiccup.
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Cytomegalovirus pneumonia by Pulmonary Pathology on Flickr

Pneumonia is a breathing (respiratory) condition in which there is an infection of the lung.

The most common symptoms of pneumonia are:

  • Cough (with some pneumonias you may cough up greenish or yellow mucus, or even bloody mucus)

  • Fever, which may be mild or high

  • Shaking chills

  • Shortness of breath (may only occur when you climb stairs)


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Smoking Kills!! by Jram23 on Flickr

  • Based on solid evidence, cigarette smoking causes lung cancer. 
  • The risks of lung cancer associated with cigarette smoking are dose-dependent and increase markedly according to the number of cigarettes smoked per day and the number of years smoked. 
  • On an average, current smokers have approximately 20 times the risk of lung cancer compared with non-smokers.

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