Question

Draw a labelled diagram of a neuron.
and explain It also.

Answer 1

Answer:

Neurons are the fundamental unit of the nervous system. Neurons are also called as nerve cells. The main function of the neurons is to pass the receiving information and send appropriate signals to the rest parts of the body. The signals received are in the form of electrical signals. Neuron comprises of dendrite, axon and cell body. Dendrites receives messages from the surrounding and sends it to the cell body. Cell body consists of nucleus, mitochondria and other organelles. Axon transmits the message away from the cell body and pass it to the the next receiving neuron.

diagram in attachment

hope it is useful for you

Answer 2

★ Structure:-

Nerve cells or neurons are the structural and functional units of the nervous system. It consists of three major parts namely, Cell body, dendrites, Axon.

★ Cell Body:-

It is irregular in shape or polyhedral. It contains cytoplasm and certain granular bodies called Nissles granules which contain a group of ribosomes for protein synthesis.

★ Dendrites:-

Dendrites are short fibres which branch repeatedly and protrude out of the cell body. They transmit electrical impulse towards the cyton.

★ Axon:-

They are long fibres arising from the cell body with a branched distal end. It terminates in a synaptic knob. It is filled with neurotransmitters.

★ Parts of Axon:-

a. Axoplasm: It is the cytoplasm of an axon.

b. Myelin sheath: It is made up of many layers of Schwann cells.

c. Neurilemma: The outermost layer of Schwann cells.

d. Nodes of Ranvier: These are gaps left by a myelin sheath.

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