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प्रश्न
With the help of a suitable diagram describe the structures of a neuron.
उत्तर
Nervous system consists of special cells called nerve cells or neurons. It has a main cell body called cyton. It gives out many processes called dendrites. From it a very long process is given out. It is called axon or nerve fibre.
The cell body has a nucleus. The dendrites get the message from the organs and send this message to the axon through the cell body. Then the axon sends the message to muscles to contrast or to the gland for secretion.
The neurons make contact with one another through their processes. The axon at its end branches and meets the dendrites of another neuron. The meeting point is called synapse. The message is passed on from one axon to the dendrites of another neuron. How the message goes ? It is like this:
Organ → Message goes to dnedrites → Cell body → Axon → Muscles or glands
APPEARS IN
संबंधित प्रश्न
Differentiate between Dendrites and axons.
Mention the exact location of the Myelin sheath
Draw neat and labelled diagrams of a myelinated neuron
Fill in the blanks:
A neuron consists of ________ , _________ and ________.
State whether the following statement is true (T) or false (F).
A double chain of ganglia, one on each side of the nerve cord belongs to the spinal cord.
What are the advantages of having a nervous system?
Identify the ODD term in each set and name the CATEGORY to which the remaining three belong :
Axon, Dendron, Photon, Cyton
Write whether the following is true or false:
Axon of one neuron communicates with other nerve cell through synapse.
Explain the following term :
Association neuron
How does an impulse travel across a synapse?
All of the following are associated with the myeline sheath except
Bipolar neurons are found in ______
Impulses travels rapidly in ______ neurons.
What does the neural tissue consist of?
What are the gaps between adjacent myelin sheaths called?
Which part of a nerve cell contains a nucleus?
Electrical impulse travels in a neuron from
Chemicals which are released at the synaptic junction are called ______.
Write one word for the following:
wave of electrical disturbance that sweeps over the nerve cell.
Write one word for the following:
The kind of nerve carrying impulses from the brain to a gland or muscle.