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Question

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


  1. The neuron is insulated by a medullary sheath

  2. Sodium pump starts operating only at the cyton and then continues into the nerve fibre

  3. Neurotransmitters are released by dendrites and not by axon endings

  4. Neurotransmitters are released by the axon endings and not by dendrites.


Solution

The correct option is D

Neurotransmitters are released by the axon endings and not by dendrites.


A synapse occurs where the axon of one neuron (the pre-synaptic neuron) meets the dendrite of another (the post-synaptic neuron). At the tip of the pre-synaptic axon is a button-shaped swelling called a synaptic knob, inside which are numerous mitochondria and vesicles packed with a substance called a neurotransmitter. This chemical, at the time of nerve impulse conduction, diffuses across space and bind to receptors in the membrane of the post-synaptic cell. This binding leads to transmission of the nerve impulse to the next neuron.

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