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Ion channel

Ion channel

(Science: cell biology) a transmembrane pore that presents a hydrophilic channel for ions to cross a lipid bilayer down their electrochemical gradients.

Some degree of ion specificity is usually observed and typically a million ions per second may flow. Channels may be permanently open, like the potassium leak channel or they may be voltage gated, like the sodium channel or ligand gated like the acetylcholine receptor.


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Difference between ADH and Aldosterone?

... is a steroid, so what it does is to interact with a nuclear receptor that eventually turns on the transcription of a gene encoding a Sodium channel.

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by MrMistery
Mon Jul 20, 2009 2:51 am
 
Forum: Human Biology
Topic: Difference between ADH and Aldosterone?
Replies: 4
Views: 3120

Alternative Theories to Evolution

Well let me give some--well maybe evidence of something that an evolutionist would never look for. You know I was watching the discovery channel the other day and I really saw it! Folds, uncracked bends in sedimentary rock, quite large bends. Wonder how they bent without cracking--they're ...

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by AFJ
Tue Jun 16, 2009 2:12 am
 
Forum: Evolution
Topic: Alternative Theories to Evolution
Replies: 13
Views: 396

Biology Experts, Help!

... 4. Beth Wood tells her nursing students that it is important to monitor patients' blood pressure when they are receiving verapamil (a calcium channel blocker). Why? Any help is appreciated. I understand if your too busy. Thanks in advance!

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by SuGrad
Wed Jun 10, 2009 4:11 am
 
Forum: Human Biology
Topic: Biology Experts, Help!
Replies: 5
Views: 298

Re: Any SOLID arguments against evolution?

... proven to greatly exaggerate ages of known-age rocks. And there is only more and more evidence of water catastrophe. You can watch the History channel and see it. Every other time I watch it there's another geologist explaining how this or that was formed by massive flooding, ice, landslides. ...

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by AFJ
Wed Jun 03, 2009 9:36 am
 
Forum: Evolution
Topic: Any SOLID arguments against evolution?
Replies: 106
Views: 16655

Natural selection is proven wrong

... kind of mutation---and it is absolutely NECESSARY for evolution to take place. If it had been observed it would have been on every headline and TV channel worldwide. This is why you can not make such an arrogant claim that evolution is scientific law! If you want to teach it as theory, I can handle ...

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by AFJ
Sun May 03, 2009 10:37 pm
 
Forum: Evolution
Topic: Natural selection is proven wrong
Replies: 177
Views: 16275
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