The Lungs
Published on Nov 20, 2015
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PRESENTATION OUTLINE
The body needs a constant supply of oxygen for a process called Cellular Respiration. Breathing in this oxygen allows the waste carbon dioxide to get out of the body.
Photo by rick
How does oxygen get to the lungs?
When you breath in, your ribs move up and out and your diaphragm flattens, pulling the air into your lungs.
Photo by Pulmonary Pathology
When you breath out, the diaphragm returns to its normal position, pushing the air out of your lungs.
Photo by Cea.
Exchange of Gases
Lungs are made up of clusters of alveoli. These are like large sacks, they have a large surface area and are kept moist. This is so the gas exchange can
Photo by Pulmonary Pathology
The Structure of the Lungs
The structure of the lungs is very complex. It starts with the Trachea, better known as the windpipe. It allows the air to enter the lungs.
The trachea then leads on to the Bronchi. These are two tubes leading off from the Trachea and into each lung. This splits the air into the two lungs.
Photo by jetheriot
They then lead on to the alveoli. The alveoli have a rich blood supply which maintains a concentration gradient in both directions. Oxygen is constantly removed from the lungs
Photo by Pulmonary Pathology
and into the bloodstream. And the same happens but in vice versa for the carbon dioxide. This is called gas exchange. The membrane of these alveoli is also very thin, allowing the gas to
Photo by Pulmonary Pathology
pass through very easily.
Photo by Pulmonary Pathology
