Term
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Definition
| involved in every thought, movement, or sensation in animals |
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Term
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Definition
| Collect incoming electrical signals; they listen |
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Term
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Definition
| when Na+ ions cross cell membrane |
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Term
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Definition
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Term
| Why don't Na+ ions cross the membrane all the time? |
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Definition
| Lipid bilayer forms barrier to most molecules |
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Term
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Definition
-straight lines
-saturated with hydrogens
-2 H on 1 C |
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Term
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Definition
-double bonds
-one H on one C |
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Term
| characteristics of phospholipid bilayers |
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Definition
-constantly moving
-membrane fluidity (fluid/viscous)
-cholesterol |
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Term
| How does cholesterol affect membrane fluidity? |
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Definition
| reduces membrane fluidity/creates regions of vicousity |
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Term
| What drives formation of membranes? |
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Definition
| need for water to form Hydrogen bonds |
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Term
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Definition
| a molecule having hydrophobic and hydrophillic regions |
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Term
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Definition
| polar regions of some molecules soluble in water |
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Term
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Definition
| non-polar, non-ionic substances |
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Term
| Is cholesterol amphipathic? |
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Definition
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Term
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Definition
| main structural component of biological membrane |
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Term
| a membrane is ________ on it's surface and _________ in its center |
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Definition
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Term
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Definition
| random movement of molecules; high to low concentration |
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Term
| Why do things move across the membranes in a particular direction? |
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Definition
| a concentration gradient is too ordered; equilibrium can be reached |
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Term
| What can get across the lipid bilayer? |
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Definition
-non-polar
-very small polar things (eg-water) |
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Term
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Definition
| diffusion of water through a membrane |
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Definition
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