Question

What is the bulbous structure present at the terminal end of each branch of the axon called ?

• A. synaptic knob
• B. synaptic vesicle
• C. synapse
• D. synaptic cleft

Answer 1

The correct option is A synaptic knob

A neuron has 3 parts - dendrites, cell body and axon. Axons often have many terminal branches, each ending as a bulbous enlargement, the synaptic knob. The synaptic knob contains vesicles filled with the neurotransmitters called synaptic vesicles.
Synapse is the site of transmission of nerve impulses between two neurons or between a neuron and a gland or muscle cell (effector). At a synapse, the membranes of the presynaptic and postsynaptic neurons are separated by a fluid-filled space called synaptic cleft.