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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?

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