Explain Why the Propagation of Action Potentials Along Electrically Excitable

question 142

Multiple Choice

Explain why the propagation of action potentials along electrically excitable membranes occurs in only one direction.

• A)The refractory period prevents it from propagating back in the direction from which it began.
• B)All electrically excitable membranes have two poles,a positive and a negative pole,and the action potential can only travel towards the positive pole.
• C)All electrically excitable membranes have two poles,a positive and a negative pole,and the action potential can only travel towards the negative pole.
• D)The stimulation of electrically excitable membranes by neurons occurs on only one side of the membrane so it will travel to the other side.
• E)The repolarization period prevents it from propagating back in the direction from which it began.

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