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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.
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संबंधित प्रश्न
Draw a labelled diagram of the following:
Brain
Receptor, Spinal cord, Effector, Motor neuron, Sensory neuron.
Renal cortex and Renal medulla [Parts of the nephrons present]
State whether the following statement is true (T) or false (F):
There are 31 pairs of cranial nerves.
Define the term Neuron.
Rearrange the following in correct sequence pertaining to what is given within brackets at the end.
Effector - Sensory neuron - Receptor - Motor neuron - Stimulus - Central nervous system Response (Reflex arc)
Name the following:
Neuron only with axon.
How does an impulse travel across a synapse?
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 ______.
Nerve cells do not possess ______
A neuron contains all cell organelles except ______.
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?
Which cells form a single layer of squamous or columnar often ciliated epithelial cells lining the ventricle?
Select the motor nerves from the following group.
Which of the following statements about transmission of nerve impulse is incorrect?
Why is the flow of signals in a synapse from axonal end of one neuron to dendritic end of another neuron but not the reverse?
CNS is mostly made of ______
Any factor that can bring a change in the body of an organism is called ______.
Rearrange the following in correct sequence pertaining to what is given within brackets at the end.
Axon endings - Dendrites - Axon - Perikaryon - Dendron (Neuron structur)
