Kainic acid is a neurotoxin as well as an activator of neurons because
A) at low doses it destroys neurons.
B) at low doses it dissolves the neuron membrane.
C) at high doses it overexcites and then kills neurons.
D) kainic acid is toxic to glial cells that nourish neurons.
E) it blocks membrane sodium channels.
Answer: D) kainic acid is toxic to glial cells that nourish neurons.
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