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Draw the structure of a neuron and expla...

Draw the structure of a neuron and explain its function.

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A neurons consists of three parts
(i) Cell body: It is a typical animal cell which contains cytoplasm and a nucleus
(ii) Dendrites: A number of long and thin fibres comes out from the cell body of the neurons, they are nerve fibre The shorter fibres on the ceil body of neurons are called dendrites
(iii) Axon: The longest fibre on the cell body of neurons is called axon It has an insulating and protective sheath (or cover)of myelin around it
Function
The information acquired at the end of the dendrictic tip of a nerve cell, sets off a chemical reacton that creates an electrical impurse. The impulse travels from the dendrite to the cell body and then along the aoxon to its end. At the end of the axon, the electrical inpulse sets off the release of some chemicals. Thes chemcials cross th gap or synapse and start similar electical impulse in a denrite of the next neuron. This is a general scheme of how nervous impulses travel in the body. A similar synapse finally allows delivery of such impulses from a neurons to other cells, such as muscles cells or gland. It si thus no surprise that nervous tissure is made up of an organised network of nerve cells or neurons, and is specilaised for conducting information via electical impulses from one part of the body to another.
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NCERT- CONTROL AND COORDINATION-Exercise
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  4. Design an experiment to demonstrate hydrotropism.

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  6. Why is the use of iodised salt advisable

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  7. How does our body respond when adrenaline is secreted into the blood?

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  9. Which of the following is a plant hormone?

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  10. The gap between two neurons is called a

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  11. The brain is responsible for

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  12. What is the function of receptors in our body? Think of situations whe...

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  13. Draw the structure of a neuron and explain its function.

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  14. How does phototropism occur in plants?

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  15. Which signals will get disrupted in case of a spinal cord injury?

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  16. How does chemical coordination occur in plants?

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  17. What is the need for a system of control and coordination in an organi...

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  18. How are involuntary actions and reflex actions different from each oth...

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