Which of the following statements is true of the activity of neurons?
A) The nerve impulse fades in strength as it travels through the neuron.
B) The size and speed of the action potential is the same for a particular axon regardless of the strength of the stimulus that sets it off.
C) Transmission of information at synapses occurs by means of direct physical contact between the nerve cells.
D) None of the above are true.

Question

Quizplus · Accepted Answer

The size and speed of the action potential is the same for a particular axon regardless of the strength of the stimulus that sets it off. This is known as the "all-or-nothing" principle. Option A is false because the nerve impulse does not fade in strength as it travels through the neuron. Option C is false because transmission of information at synapses occurs via chemical signals called neurotransmitters, not by direct physical contact.

Which of the Following Statements Is True of the Activity