Q. 225.0( 1 Vote )

Observe the following diagrams that depict the transmission of nerve impulses through two pathways from body parts to CNS:



If all the nerves at both the places are similar in thickness and structure, through which pathway will the transmission of an impulse (of the same threshold) be faster and why?

Answer :

The transmission will be faster in the pathway P.

Reason- The thickness and structure of the neurons in pathway p and pathway Q are same. But the length of neurons and number of synapses are different in both the pathways.


As the lengths of the axons are greater in pathway P due to which the nerve impulse will travel a longer distance in shorter time and as there are less number of synapse here the leakage in impulse and time in the transmission will be less.


On the other hand in pathway Q the length of neurons are smaller due to which more neurons will be required and there will be leakage of impulses and more time consumption as there are more number of synapses due to which in order to transmit impulse to the next neuron at each synapse, time will be consumed. So, transmission of impulse will be slower.


Therefore, due to above-mentioned reasons, nerve impulse will travel faster in pathway P.


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