Question

Nerve impulse through synapse is

• A. unidirectional
• B. bidirectional
• C. multidirectional
• D. none of the above

Answer 1

The correct option is A

unidirectional

The correct option is A.

Explanation of the correct option:

1. To pass nerve impulses from one cell to another cell, they must cross the synaptic junctions, it is the junction between the axon terminal of the presynaptic neurons and the dendrites of the post-synaptic neurons.
2. As the neurotransmitters (a chemical messenger) from the presynaptic neuron are settled into the synaptic cleft, these are perceived by the receptors situated on the dendrites of the post-synaptic neurons. The impulse in this way can travel only in one direction (or unidirectional), which means from the axon terminal of the presynaptic neuron to the dendrites of the postsynaptic neuron.
3. Due to the single way of neurotransmitter storage vesicles and receptors, the nerve impulse is one direction.

Final answer: Nerve impulse through synapse is unidirectional.