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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
Draw a labelled diagram of the following:
Neuron
Differentiate between Myelinated and non-myelinated axons.
Distinguish between Cranial nerves and spinal nerves.
Briefly explain the following terms: Synapse
The diagram given below is a representation of a certain phenomenon pertaining to the nervous system. Study the diagram and answer the following questions:
(i) Name the phenomenon which is being depicted.
(ii) Give the technical term for the point of contact between the two nerve cells.
(iii) Name the parts 1, 2, 3, and 4.
(iv) Write the functions of parts 5 and 6
(v) How does the arrangement of neurons in the spinal cord differ from that of the brain?
Fill in the blank:
The neurons carrying impulses from the brain to the muscles are called _______________________.
Describe the two parts of the nervous system.
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.
Given below is a structure, write its special functional activity.
Myelin sheath and ……………
Identify the ODD term in each set and name the CATEGORY to which the remaining three belong :
Axon, Dendron, Photon, Cyton
Name the following:
The nerve which carry impulse from CNS to muscles.
Write whether the following is true or false:
Neurotransmitters are either broken down or reabsorbed after they have conducted an impulse.
Explain the following term :
Motor nerve
Explain the following term :
Association neuron
Brain is a part of _________ nervous system.
Compare and contrast.
Sympathetic Nervous System and Parasympathetic Nervous System
Which of the following statements is wrong regarding conduction of nerve impulse?
All of the following are associated with the myeline sheath except
When the potential across the axon membrane is more negative than the normal resting potential, the neuron is said to be in a state of ______.
Bipolar neurons are found in ______
Nerve cells do not possess ______
The structural and functional units of the nervous system is ______.
Axons ____________.
What are the different parts of the multipolar neuron?
What are the gaps between adjacent myelin sheaths called?
Which cells are responsible for formation of myelin sheath?
Select the motor nerves from the following group.
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.
Electrical impulse travels in a neuron from
In a synapse, chemical signal is transmitted from
In a neuron, conversion of electrical signal to a chemical signal occurs at/in
Write one word for the following:
wave of electrical disturbance that sweeps over the nerve cell.
Which of the following structures is absent in nerve cells?
Name the following:
Three main parts of the neuron
