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11 Cards in this Set
- Front
- Back
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What is the role of a pump on the plasma membrane? |
Maintain concentration gradients by moving substances against their concentration gradient.this requires energy. |
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What pumps are found on a neuron? |
Sodium-potassium pumps and calcium pumps |
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What is the role of a channel on a plasma membrane? |
Allow substances to move down tgeir concentration gradient |
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What is a leak channel? |
A channel that is alwats open and allows continous diffusion of a specifoc type of ion from an area of high to low concentration |
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What is a chemically gated chanel? |
These channels are normally closed except when binded to a specific chemical - like a neurotransmitter |
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What is the role of a voltage gated channel on the plasma membrane? |
Channels that are normally closed, but that open in response to changes in electrical charge |
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Why are sodium voltage gated channels unique? |
Unlike most that have one gate, Na+ have 2 gates, activation and inactivation gates |
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What is the resting state of an Na+ channel? |
The inactivation gate is open, but the actovation gate is closed, so Na+ can't pass through |
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What is the activation gate of an Na+ channel? |
Both the inactivation and activation gates are open so that Na+ can pass through |
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What is thr inactivation state of an Na+ channel? |
The activation gate is open, but the inactivation gate is closed. Na+ cant pass through |
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What is a modality gated channel? |
A channel that opens in response to a stimulus other than chemical or voltage. These are found on sensory neurons. |
