Respiratory System
By: Meghan Lake - 6th Period


The Respiratory System is a system made up of organs in your body that help you breath. The main point is to breath in (oxygen) and breath out (carbon dioxide). This system gets the oxygen you breath in to the bloodstream. The oxygen is entered through the mouth and nose and exhaled the same way. The oxygen passes through trachea (Trachea: filters the air we breath and branches into the bronchi). It then goes through the chest cavity and is broken into two parts. The bronchi takes it into the lungs which is then is broken into smaller tubes. The carbon dioxide goes the same way to get out.


In the lungs, the oxygen is taken in and the carbon dioxide taken out. The red blood cells drop off the oxygen to the body systems and pick up carbon dioxide to breath out (exhale).  So the main goal for the lungs is to take the oxygen and get rid of the carbon dioxide because it is toxic to your body.

The Lungs are the main organs in the respiratory system.

Respiratory System Tour

The respiratory system starts at the mouth and ends at the lungs were it is then turned around and releases carbon dioxide. Here is a video of how the respiratory system work. Please stop at 1 minute.


The movement of gas through the larynx (larynx: is a hollow, muscular organ forming an air passage to lungs and vocal cords), pharynx (pharynx: the membrane lined cavity behind the nose and mouth), and the mouth allows you to speak.

Nose & Navel Cavity

Is the main external opening in the respiratory system. The protects the anterior portion of the nasal cavity, just like in the example below. The picture shows where the nasal cavity along with the septum, the turbines, the mucous membrane, and  the sinuses.

The Nostrils

Nostrils are involved in the air intake in which they bring air in the nose were it is humidified and warmed.

Oral Cavity

Known as the mouth by most, does not perform any specific functions but it can supplement the air inhaled through the nose. It is also the alternate source of breathing other than the nasal cavity. It also lacks the mucous membrane that filters extra, unneeded substances. The good thing about the oral cavity is the pathway leading from  the mouth is shorter which means more air comes in a shorter amount of time. (Example: when you are out of breath you breath through your mouth right?)  

The oral cavity (mouth) labeled.

Why do we breath out Carbon Dioxide?

Humans need oxygen just like plants need carbon dioxide. So when the oxygen comes into your bloodstream it takes place of the carbon dioxide and the carbon dioxide goes out through the same way but going out, just like the video below. Please stop at 30 seconds.

More Pictures of the Respiratory System

Fun Facts:

  • The right lung is slightly larger than the left.
  • The surface area of the lungs is roughly the same size as a tennis court.
  • We lose half a liter of water a day through breathing. This is the water vapor we see when we breathe onto glass.
  • The breathing rate is faster in children and women than in men.

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