How Do Graded Changes in Membrane Potential Give Rise to All-Or-None

question 152

Multiple Choice

How do graded changes in membrane potential give rise to all-or-none changes that generate action potentials?

• A) The membrane recognizes only action potentials generated by positive ions,causing a voltage threshold to be reached.
• B) The membrane recognizes only action potentials generated by negative ions,causing a voltage threshold to be reached.
• C) Many graded potentials at different points along the membrane are summed,causing the voltage threshold to be reached.
• D) Many graded potentials reaching the same point on the membrane are summed,causing the voltage threshold to be reached.
• E) The membrane allows only voltage-gated channels to open and close,enabling an electrical charge gradient to be created.

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