Need Help! (GCSE BIOLOGY)

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Kiko M
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#1
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#1
Trying to re write notes and confused..

Does a rich blood supply in alveoli mean it maintains a steep concentration gradient??

That's what I've written in notes from class but I can't see it anywhere on revision guides so wondering if I heard wrong or something, please help!
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username2888406
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#2
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#2
Yes that's correct. Having a rich blood supply delivers blood that is low in oxygen and high in carbon dioxide to the lungs. The air entering the lungs is high in oxygen and low in carbon dioxide (opposite to what is in the blood vessels), this creates a steep concentration gradient between the blood and the air inside the alveoli causing rapid diffusion of carbon dioxide to leave the blood and oxygen to enter the blood. A strong blood flow (it comes directly from the heart so under high pressure) means the steep concentration gradient is maintained because once the blood absorbs oxygen it's moved away quickly.
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MimiSeneca
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#3
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#3
if you're doing notes on blood and the lungs (the double circulatory system etc) I found these really useful because have diagrams included and good level of detail (not too much that it's overwhelming but all the main facts) https://senecalearning.com/resources...latory-system/ there are also good notes on other biology topics on this site !
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