Which of the Following Is True Regarding HCN Channels in the Neuronal

question 21

Multiple Choice

Which of the following is true regarding HCN channels in the neuronal membrane?

• A) They are responsible for the bulk of the flow of potassium from the cell at rest.
• B) They are voltage-activated at hyperpolarized membrane potentials.
• C) They are nonspecific ion channels that allow chloride ions to flow into the cell.
• D) They have a 4:1 ratio of potassium to sodium, allowing sodium to flow into the cell.
• E) They are blocked by tetrodotoxin.

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