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Ion Channels

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Integral proteins
What structures in the cell membrane function as ion channels?
Charge, size and the amount of water the ion attracts
Ion channels are selective for specific ions. What three characteristics of the ions are important for this selectivity?
nongated
Channels can be classified as either gated or nongated channels. A sodium channel that is always open would be classified as a/an __________channel.
yes
Would sodium ions move into or out of the neuron through nongated channels?
-55mV
Voltage-gated potassium channels open at what voltage? __________ mV
sodium and chloride
Acetylcholine (ACh) and GABA are neurotransmitters that open chemically-gated channels. What ions pass into the cell when these channels are activated?
dendrites, cell body and axon - resting membrane potential
Ion channels are regionally located and functionally unique. List all the areas on the neuron and the type of potential dependent on non-gated ion channels
dendrites and cell body - synaptic potentials
Ion channels are regionally located and functionally unique. List all the areas on the neuron and the type of potential dependent on chemically-gated ion channels
axon hillock and axons - action potential
Ion channels are regionally located and functionally unique. List all the areas on the neuron and the type of potential dependent on voltage-gated ion channels
ion and GABA channels
Name two channels (gated or nongated) through which chloride ions could pass into the cell through.
voltage-gated sodium channels
The Japanese puffer fish contains a deadly toxin (tetrodotoxin). What type of channels does this toxin block?
action potential .
What potential would theJapanese puffer fish toxin block?
paralasis of the muscles used for breathing
What specifically would cause death from theJapanese puffer fish toxin?