What is the purpose of sodium ion channels in neurons? (Be specific

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1. What is the purpose of sodium ion channels in neurons? (Be specific.)
2. How and why would blocked sodium ion channels affect excitability of a neuron?
3. What are the biological effects of tetrodotoxin on humans?
4. How and why would voltage-gated sodium channels opening at a lower voltage affect neuronal excitability?
5. If the sodium channels don't inactivate midway through an action potential, what will be the result?
6. What are the biological effects of batrachotoxin on humans?
7. How and why will blocking voltage-gated potassium channels affect neuron firing?
8. What are the biological effects of dendrotoxin on humans?
9. How and why will neuronal signaling be affected if the axon cannot release acetylcholine into the synaptic cleft?
10. What are the biological effects of botulinum toxin on humans? (Not looking for beauty tips here!)