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प्रश्न
Explain the function of the neuron.
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
Distinguish between Impulse conduction in a myelinated nerve fibre and unmyelinated nerve fibre
Mention the exact location of the Myelin sheath
Name the following :
The layer of the eyeball that forms the transparent Cornea
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________.
Write the function of synapse.
Write the function of medullary sheath.
Rearrange the following in correct sequence pertaining to what is given within brackets at the end.
axon endings → nucleus → Dendrites → axon → perikaryon → Dendron(Neutron structure)
Answer the following questions briefly:
How are the cytons and axons placed in the brain and the spinal cord?
Name the following:
The nerve which carry impulse from CNS to muscles.
Write whether the following is true or false:
Neurotransmitters are released on activation.
Explain the following term :
Association neuron
How does an impulse travel across a synapse?
Differentiate between:
A Sensory neuron and a Motor neuron (function)
___________ nervous system prepares us for the fight or flight responses.
Compare and contrast.
Sympathetic Nervous System and Parasympathetic Nervous System
At the end of repolarization, the nerve membrane gets hyperpolarized. Why?
Impulses travels rapidly in ______ neurons.
______ carries the impulse towards the cell body.
Classify neurons based on their structure.
‘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?
Identify the INCORRECT statement regarding multipolar neuron.
What are the gaps between adjacent myelin sheaths called?
Which cells form a single layer of squamous or columnar often ciliated epithelial cells lining the ventricle?
The longest fibre on the cell body of a neuron is called ____________.
Assertion: Impulse travels from dendrite to cell body and then along the axon to its end.
Reason: Information acquired at the end of the dendrite tip of a nerve cell sets of an electric impulse.
CNS is mostly made of ______
The mammalian nervous system uses both electrical and chemical means to send signal via neurons. Which part of the neuron receives impulses?
Write one word for the following:
A bundle of axons enclosed in a tubular sheath.
The basic structural and functional unit of brain is ______.
Which of the following structures is absent in nerve cells?
Note the relationship between the first two words and suggest the suitable word/words for the fourth place.
Axons : Nerve :: Cytons : ______.
Name the following:
Three types of nerves.
Name the following:
Three main parts of the neuron
