Synaptic Transmission

Q.

Neurons with myelin sheath conduct nerve impulse

1. faster than the neurons without the myelin sheath

2. at the same speed as the neurons without myelin sheath

3. slower than the neurons without myelin sheath

4. in greater number than neurons without myelin sheath.

Q. Transmission of nerve impulses through nerve fibres are unidirectional because

1. nerve fibres are insulated by a medullary sheath
2. sodium pump starts operating only at the cyton and then continues into the nerve fibre
   
3. neurotransmitters are released by dendrites and not by axon endings
   
4. neurotransmitters are released by the axon endings and not by the dendrites