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7 Cards in this Set
- Front
- Back
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What are some properties of Electronic potentials?
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1. Time
2. Space |
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How are electronic potentials propagated?
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1. passive
2. graded |
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What equation tell us about electronic potentials membrane time constant (τ) i.e how fast does the Vm rise upon stimulation?
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τ=R*C
R= resistance (# of channels opened) C=charge stored on membrane(surface area) |
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What does the space constant (λ) if the elctronic potential tell us?
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How far the Vm spreads ...depends on diameter of cell
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What non-excitable cells make use of membranse potentials?
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1. Beta cells
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How does the opening of the ATP-Sensitive-K+ Channel cause the release of Insulin?
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1. Glucose comes in
2. ATP is made 3. ATP block ATP-Sensitive-K+ Channel 4. Membrane depolarizes 5. Ca++ turn on 6. Ca++ comes in 7. Ca++ cause pre-formed Insulin granules to be released |
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How do you change the amplitude of the Action Potential?
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decrease the concentration of Na+ outside
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