Synaptic vesicles contain chemicals called

Alzheimer's disease in humans is associated with the deficiency of

The venom of a cobra primarily affects the:

Assertion : Transmission of nerve impulse across a synapse is accomplished by neurotransmitters.
Reason : Transmission across a synapse usually requires neurotransmitters because there is a small space, i.e., $synaptic \ cleft$, that separates one neuron from another.

Nerve fibres conduct impulses in

What is a neurotransmitter?