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Cell membranes

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Cell membranes

Postby Aerlinn » Wed Feb 01, 2006 10:35 am

Many biological functions depend on the properties of membranes. Give 2 reasons why alcohol is absorbed more rapidly from the gut than most foods eaten at the same time.
Also, suggest why a breathalyser is able to give a relatively accurate indication of blood alcohol level.
Some help, please? All this in terms of cell membranes, of course :)
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Postby Poison » Wed Feb 01, 2006 4:52 pm

As much as I know, for your first question, alcohol is a small molecule that's why it is taken in quickly.
I don't know about your second question. I would like to learn too. :)
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Postby MrMistery » Wed Feb 01, 2006 6:19 pm

Our good friend etilic alcohol-CH3CH2OH- is quite a small molecule, and also a main reason for the fast absorbtion speed is the fact that it is non-polar and can pass directly throught the membrane, it doesn't need a transport protein
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Postby blindcat35 » Sat Feb 04, 2006 5:57 am

there r alot of reason to expland why alcohol can adsorp rapidly than food
1 . it is small mole....
2 . we drink alot in one time it make high concentration
3 when ancohol take in neuron receptor it will increase metabolism to absorpt alot ...
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Postby Dr.Stein » Sat Feb 04, 2006 3:47 pm

Because alcohol can easily diffuse thru lipid membrane of cells.

What is "breathalyser"? :?
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Postby MrMistery » Sat Feb 04, 2006 5:12 pm

probably those things the police use, you exhale into it and it shows how much you had to drink(answer: it comes from the blood in the lungs..)
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Postby Poison » Sat Feb 04, 2006 5:14 pm

Blood to the lungs? Do you give out alcohol together with CO2 or something like that?
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Postby MrMistery » Sat Feb 04, 2006 5:25 pm

yes, alcohol "evaporates" out of your lungs along with CO2 and water...
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Postby 2810712 » Sat Feb 04, 2006 5:25 pm

means you give out alcohol vapours with exhelant? And you alcohol can easily pass out the lung-cell-membranes in same way. And lung also has large surface are as digestive tract has.So alcohol's exhaling is similar to its fast intake from digestive tract.

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Postby Poison » Sat Feb 04, 2006 5:26 pm

MrMistery wrote:yes, alcohol "evaporates" out of your lungs along with CO2 and water...


Thanks. I learnt something new today. ;)
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Postby blindcat35 » Sun Feb 05, 2006 11:34 am

which way ancohol digest ??? in any way
1 evaporate at lung ( so drink and speak we can drink alot !
2 liver
3 kiney??
???
???
anyone know more ?? tell me
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Postby Poison » Sun Feb 05, 2006 3:58 pm

You do not "digest" alcohol. It is changed into simpler substances,that are not foreign for the body, by liver.
And if the evporation rate was enough, you didn't need to speak, you can just breath like you always do. :)
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