Question

1) What determines the direction of flow of impulse in nerve?

2) Which is the nerve arising from the ventral horn of spinal cord?

3) Give functions of : Node of ranvier, Nissl granules, Synapse.

Answer 1

1.The nerve impulse flows in one direction only i.e. downwards from the axon. This is because of the polarization generated by sodium ions in the particular direction.

Answer 2

Answer:

synapse is junction of two neurons

the gaps in myelin sheath are called nodes of ranvier