A) nerve fibre is insulated by a medullary sheath
B) sodium pump starts operating only a-t the cyton and then continues into the nerve fibre
C) neurotransmitters are released by dendrites and not by axon endings
D) neurotransmitters are released by the axon endings and not by dendrites
Correct Answer: D
Solution :
Transmission of nerve impulse through nerve fibre occurs unidirectionally because axon of one neurone linked to the dendrite of another neurone through synapse. Synaptic vesicles are filled with a neuro transmitter (e.g., Acetylcholine ) released by axon endings not by dendrites.
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