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Gas Exchange in the Lungs

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Science


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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.

 

Active transport in the human body


Active transport is used in the gut when there is a low concentration of nutrient

in the gut, but a high concentration in the blood.

When there is a lower concentration in the gut and the nutrients need to enter the

blood then active transport allows the nutrients to travel against the concentration

gradient.


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