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प्रश्न
Explain the function of the neuron.
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उत्तर
- The neuron is the structural and functional unit of the nervous system.
- The main function of neurons is to transmit signals to and from the brain. Neurons are arranged end to end, forming a chain. This helps in the continuous transmission of impulses. Each neuron receives an impulse through its dendrite and transmits it to the next neuron in a sequence through its axon.
- A neuron's dendritic tip receives information that triggers a chemical process that results in an electrical impulse. The impulse leaves the dendrite and moves along the end axon. The electrical impulse at the end of the axon triggers the release of certain substances, which pass through the synapse and initiate a comparable impulse in the dendrite of the subsequent neuron. Nerve impulses go throughout the body in this manner.
- Therefore, nervous tissue is composed of a well-organised network of neurons that are specialised in sending electrical impulses from one area of the body to another in order to transmit information.
APPEARS IN
संबंधित प्रश्न
Name the following :
The layer of the eyeball that forms the transparent Cornea
Mention the exact location of the Lacrimal gland
Differentiate between the following pair of terms:
Receptor and effector.
With the help of a suitable diagram describe the structures of a neuron.
Fill in the blank:
Basic structural unit of the nervous system is the________.
Complete the following statement by choosing the correct alternative from the choice given in below :
The dorsal root ganglion of the spinal cord contains cell bodies of ________ neurons.
Rearrange the following in correct sequence pertaining to what is given within brackets at the end.
Repolarisation - Depolarisation - Resting (polarised) (during conduction of nerve impulse through a nerve fibre)
What are the advantages of having a nervous system?
Write whether the following is true or false:
Axon of one neuron communicates with other nerve cell through synapse.
Differentiate between:
A Sensory neuron and a Motor neuron (function)
During synaptic transmission of nerve impulse, neurotransmitter (P) is released from synaptic vesicles by the action of ions (Q). Choose the correct P and Q.
‘A’ is a cylindrical structure that begins from the lower end of the medulla and extends downwards. It is enclosed in bony cage ‘B’ and covered by membranes ‘C’. As many as ‘D’ pairs of nerves arise from the structure ‘A’.
(i) What is A?
(ii) Name (a) bony cage ‘B’ and (b) membranes ‘C’
(iii) How much is D?
Our body contains a large number of cells ‘L’ which are the longest cells in the body. L has long and short branches called ‘M’ and ‘N’ respectively. There is a gap ‘O’ between two ‘L’ cells, through which nerve impulse transfer by the release of chemical substance ‘P’.
(i) Name the cells L?
(ii) What are M and N?
(iii) What is the gap O?
(iv) Name the chemical substance P?
What are the gaps between adjacent myelin sheaths called?
The longest fibre on the cell body of a neuron is called ____________.
What is the correct direction of flow of electrical impulses?
In the following diagram choose the correct labelling for A, B, C, D and E respectively.
Any factor that can bring a change in the body of an organism is called ______.
Note the relationship between the first two words and suggest the suitable word/words for the fourth place.
Axons : Nerve :: Cytons : ______.
Give reason:
Neurotransmitters are broken down by an enzyme just after passing an impulse from one neuron to the other.
