Question

Unidirectional transmission of a nerve impulse through nerve fibre is due to the fact that

• A. Neurotransmitters are released by dendrites and not by axon endings
• B. Sodium pump starts operating only at the cyton and then continues into the nerve fibre
• C. Neurotransmitters are released by the axon endings and not by dendrites
• D. Nerve fibre is insulated by a medullary sheath

Answer 1

The correct option is C

Neurotransmitters are released by the axon endings and not by dendrites

The transmission of the impulse occurs via release, diffusion, receptor binding of neurotransmitter molecules and unidirectional communication between neurons. Neurotransmitters are released at axon terminals. The axons transmit nerve impulses away from the cell body to a synapse or to a neuro-muscular junction.