A Nerve Cell Body Is Able to Depolarize Within Only

question 59

Multiple Choice

A nerve cell body is able to depolarize within only one millisecond because,when the threshold potential is reached,

• A) the entire length of the membrane is affected at once.
• B) large numbers of voltage-gated K⁺ channels open very quickly.
• C) large numbers of voltage-gated Na⁺ channels open very quickly.
• D) only a very small electrical change is needed to reverse polarity.
• E) only a single signal is usually required to cause depolarization.

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