The Substance Tetrodotoxin (TTX), Found in the Ovaries of Pufferfish

question 123

Multiple Choice

The substance tetrodotoxin (TTX) , found in the ovaries of pufferfish, is useful for studying the ionic mechanisms of the neuron because it

• A) selectively blocks sodium channels.
• B) selectively blocks potassium channels.
• C) prevents ion channels from closing.
• D) directly stimulates neurons.

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