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Gas Exchange In The lungs

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Gas exchange in the lungs

The lungs are optimized to ensure that exchange happens efficiently as

possible. In the lungs the two main gases that are exchanged are oxygen

and carbon dioxide. This gas exchange across the Alveoli.


Features of the alveoli

The alveoli are small structures within the lungs which resemble a hollow

bunch of grapes. They help to increase surface area, they have very thin

walls and have a very large blood supply. All these factors help to increase

 the rate of diffusion.


Diffusion – the concept of diffusion is very simple – gases move from an area

of high concentration to an area of low concentration.



This illustration will help you understand diffusion. In alveoli the oxygen

moves from the alveoli into the blood for it to be transported around the body. 

The carbon dioxide moves from the blood  back into the alveoli so it can be

breathed out again.

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