alright... here's the question:
Why is it important that ions being transported across a cell membrane be shielded from the interior of the lipid bilayer?
2006-11-20 10:29:32 · 4 answers · asked by holaaloha12345 4 in Science & Mathematics ➔ Biology
The interior of the lipid bilayer is hydrophobic; ions, by definition, are hydrophillic. If the ion interacts with the hydrophobic environment of the lipid bilayer, this is energetically unfavorable. It will cause the ion to move back out of the membrane, preventing ions from passing through the membrane at a useful rate. Ion channels allow the passage of ion by preventing the ion from interacting with the lipid bilayer, or by orienting the ion so that it interacts favorably.
2006-11-20 12:12:53 · answer #1 · answered by bflute13 4 · 0⤊ 0⤋
The lipid bilayer is hydrophobic and does not interact with charged particles. This means that for an ion to cross the membrane it has to be shielded as it is not soluble in the bilayer.
2006-11-20 10:34:29 · answer #2 · answered by champagne0684 2 · 0⤊ 0⤋
It is important for substances that pass the lipid bi-layer to be soluble in it. for a substance to be soluble in lipid bi-layer needs to interact with it. ions are charged particles and as these they interact with water and are surrounded by water molecules. in this state thy can not pass the lipid bi-layer because as we all know water is not soluble in lipid as it isn't in cell membrane. this is the reason why trans membrane proteins that form water pores for ions to pass exist.
2006-11-20 11:11:52 · answer #3 · answered by g m 1 · 0⤊ 0⤋
A Ca2+ ATPase is located in the plasma membrane of all eukaryotic cells. It makes use of the ability presented by utilising one molecule of ATP to pump one Ca2+ ion out of the cellular. The interest of those pumps enables to maintain the concentration gradient of Ca2+ between the cytosol and the ECF. Ca2+ ions additionally are pumped out of cells by utilising sodium-pushed antiport pumps. In antiport pumps (aka secondary lively transport), the driving ion (often sodium) diffuses in direction of the pump in one path, offering the ability for the lively transport of another molecule or ion (Ca2+) in the choice path.
2016-12-28 07:09:30 · answer #4 · answered by ? 3 · 0⤊ 0⤋