A key contribution of Hermann von Helmholtz to the study of neuron function was
A) a mathematical formula to describe the conservation of energy.
B) a theory of black-white vision.
C) his invention of the ophthalmoscope.
D) measuring the conduction speed through nerves of the action potential.
E) his creation of the ablation method.
Answer: D
Rationale: A key contribution of Hermann von Helmholtz to the study of neuron function was his measurement of the conduction speed through nerves of the action potential.
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