username3895014
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Struggling with this:

“Explain why a parallel flow gas exchange system would be less efficient than a counter-current gas exchange system” (it’s only 3 marks)

This is for A-level Biology btw
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Sharemine
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As with a parallel flow , equilibrium will eventually be reached. Therefor there will not be a high conc gradient of oxygen across the whole length, minimising diffusion
(Original post by Wooord)
Struggling with this:

“Explain why a parallel flow has exchange system would be less efficient than a counter-current has exchange system” (it’s only 3 marks)

This is for A-level Biology btw
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Sharemine
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Ps , write it as a comparison
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username3895014
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(Original post by Sharemine)
As with a parallel flow , equilibrium will eventually be reached. Therefor there will not be a high conc gradient of oxygen across the whole length, minimising diffusion
(Original post by Sharemine)
Ps , write it as a comparison
Thank you so much !
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Jpw1097
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(Original post by Sharemine)
As with a parallel flow , equilibrium will eventually be reached. Therefor there will not be a high conc gradient of oxygen across the whole length, minimising diffusion
Exactly. It maintains a high concentration gradient and since the rate of diffusion is proportional to the concentration gradient (using Fick's law), this will maximise the rate of diffusion.
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