Which of the following is true? Group of answer choices In the brain, neurons are more abundant than neuroglia. An action potential never occurs in dendrites. When a neuron is stimulated, Na + gates open and allow Na + to exit the cell. In a myelinated fiber, only the initial segment in the trigger zone has voltage-regulated channels. Norepinephrine is a neuropeptide.

The true statements are:

An action potential never occurs in dendrites.

Norepinephrine is a monoamine.

Explanation:

In the following question only two statements are true that are; an action potential never occurs in dendrites as it occurs in nerves to send signals from cell body and axon and transmit it.

The second correct statement is Norepinephrine is a monoamine as these are particular neurotransmitters dopamine, serotonin, also known as catecholamines sometimes.

Thus, the correct answer is:

An action potential never occurs in dendrites.

Norepinephrine is a monoamine.