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17 Cards in this Set
- Front
- Back
What is Resting membrane Potential?
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around -40 to -70
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What is the nernst potential for K+
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-92mV
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What is the nernst potential for Na+
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59mV
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What is the nernst potential for Cl-
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-83mV
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What is the nernst potential for Ca++
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134mV
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What are the two forces that determine the resting membrane potential?
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Diffusional Force (chemical force) and Electrical Force
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At what state do we have no NET movement of ions?
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Equilibrium potential state
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Explain what Depolarization is?
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the neuron inside has become more positive
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Explain what hyperpolarization is?
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the neuron inside has become more negative
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Explain what repolarization is?
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the neuron inside has returned to RMP
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What are the two types of electrical signals that occur in neurons?
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graded potentials (passive)
action potentials (active) |
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Name three main types of gated channels.
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Ligand gated channels
Voltage gated channels Sensory-stimulus gated channels |
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Openining of the gated channels results in a change of membrane permeablitiy, so what happens durring hyperplorization?
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Open Cl- channels or K+ channels
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Openining of the gated channels results in a change of membrane permeablitiy, so what happens durring depolarization?
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Open of Na+ channels or Ca++ channels
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What are the two types of graded potentials?
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EPSP's
IPSP's |
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EPSP's and IPSP's are measured and summed at what part of a neuron?
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Axon Hilluck
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Name some differences between Action Potentials and graded Potentials.
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AP's;
all or none, only occur on axon, always depolarizing,only initiated at axon hillock, do not decay w/ distance GP's; amp is variable, anywhere on a neuron, can be depol/hyper |