Question

Axon is characterized by
A. Transformation of energy
B. Receiving the impulse
C. Providing energy for impulse
D. Conduction of impulse

Answer 1

A neuron is a nerve cell with all its branches and forms the structural and functional unit of the nervous system. It is the communication unit of most nervous systems as it detects, receives and conducts the nerve impulses to various parts of the body.

Complete answer: One or more cytoplasmic processes arising from the cyton are called nerve processes. These are of two types-axon and Dendron.
Axons are single, long and cylindrical processes whose primary function is to conduct the nerve impulses away from the cyton, so it is different or conducting in nature and it is the longest nerve process of a neuron. Axolemma is the term used for the plasma membrane of the axon while its cytoplasm is called axoplasm. It has only neurofibrils while the Nissl’s granules are absent in it. It may form a number of branches called terminal arborization, each branch of which forms a junction with muscle fibre called neuro-muscular junction or with Dendron or cyton of another neuron called synapse.
Dendrons are defined as one or more small sized tapering processes that are highly branched to form the terminal arborization. These are afferent in nature so they conduct the nerve impulses towards the cyton so also called the receptive input region.
The neurons may be aggregated into cell mass or may lie end to end forming a chain. Each neuron receives a nerve impulse through its dendron and passes it to the next neuron through its axon.
So, the correct answer is “Option D”.

Note: An axon ends into a number of branches, the ends of which form knob-like swellings called synaptic knobs which come to lie very close to the dendron of the next neuron. This junction between the synaptic knob of the axon of one neuron and the dendron of the next neuron is known as synapse.