Which of the following statements is true?
A) A neuron fires in response to every message it receives.
B) Signals above the threshold of excitation will prevent a neuron from firing.
C) Impulses in myelinated neurons may reach speeds of nearly 400 feet per second.
D) The strength (intensity) of a neuron's action potential depends on the strength of its excitation.

Question

Quizplus · Accepted Answer

Impulses in myelinated neurons may reach speeds of nearly 400 feet per second. This is due to the insulation provided by the myelin that allows for the rapid conduction of signals along the axon. Option A and B are incorrect as a neuron does not fire in response to every message it receives, and signals above the threshold of excitation will cause a neuron to fire, not prevent it. Option D is also incorrect as the strength of a neuron's action potential is constant and not dependent on the strength of its excitation.

Which of the Following Statements Is True