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Home Q & A Board Biology-Related Homework Help Cell Biology
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__Aycee __Aycee
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11 years ago
If a toxin blocks the Ca+ channels, can a neuron exposed to the toxin fire an action potential and/or can it transmit a signal across the synapse using neurotransmitters? Please explain.
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#1
11 years ago
No, if It blocks the Ca+ channels exocytosis of the specific neurotransmitters wont occur even with the arrival of an impulse since the Ca+ should open for the occurrence of exocytosis. Thus the post synaptic neuron wont depolarize, thus the impulse does not propagate!!
The mode of action of toxin: The toxin sets on the Ca+ channels blocking the setting of calcium ions on the channels, thus Ca+ wont enter, therefore no exocytosis.
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#2
11 years ago
No. If calcium channels are blocked then neurotransmitter are not able to exocitose into the synapse which will have sodium activate ligand gated channels for another action potential.
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