The one way or unidirectional transmission of nerve impulse in nerve cells is due to the presence of
a)	Synapses	b)	Myelin sheath	c)	Membrane polarity	d)	Interneurons

(a)

A nerve impulse may be defined as wave of depolarization of the membrane of the nerve cell. The nerve impulse travels along a neuron across a synapse (junction), between one neuron and another or between a neuron and an effector, such as a muscle or gland. The synapse is an area of functional contact between one neuron and another for the purpose of transferring information. Sir Charles Sherrington (1861-1954) was the first person, who used the term ‘synapse’ to the junctional points between two neurons.