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Definition
describes how a solution effects a cell
* depends on the relative concentration of non penetrating solutes
[image]
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Definition
| freely diffuse across plasma membrane |
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Definition
cannot diffuse across plasma membrane
* only the concentration of non-penetrating solutes contributes to the tonicity of the solution |
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| Which moves first the particles or water? |
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Definition
1. Penetrating particles moves down it's [] gradient
2. Then water moves via osmosis |
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| Resting membrane potential |
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Definition
Difference in charge between the inside and the outside (mV)
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Definition
an electrogenic pump that sets up a chemical and electrical gradient
*electrogenic pump is any pump that sets up electrical disequilibrium
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Definition
Only permeable to Na+ +66 mV
K+ -90 mV
*cells are more permeable to K+
[image]
Changes in ion permeability change the membrane potential |
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| Changes in membrane potential- terms |
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Definition
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Definition
| More positive (less negative) |
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| Less positive (more negative) |
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