Which of the following statements concerning the properties of action potentials is TRUE?
A. A supra-threshold stimulus can stimulate an action potential during the absolute refractory period.
B. Action potentials generally propagate from the axon terminal toward the axon hillock.
C. The rate of propagation of an action potential down an axon is independent of stimulus strength.
D. Increasing the size of a stimulus will increase the amplitude of an action potential.
E. Action potentials can undergo summation.
Answer: C
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