how does your nervous system work?

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i rteally dont un derstand how this works and how the motor neurons and sensory neurons etc

Posted Sat 19th May, 2012 @ 22:25 by kiran98

4 Answers

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Hey Kiran :) We did this in Science

Answered Sun 20th May, 2012 @ 09:22 by Kamal Patel
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Well the nervous system works by tranferring electrical impulses across synapses towards the brain where the information can be processed and a response can be given.

There is also something called a reflex arc. The reflex arc is a immediate response to some sort of danger in which you have no control of. It goes in this order:

Stimulus: An outside disturbance which causes a response from your body (e.g. heat from fire)

Receptor: You have different receptors in you rskin including pressure and temperatures. These receptors are linked to the sensory neurones.

Sensory Neurones: recieve the impulse from the receptor. Travels across neurones to reach the CNS where it reaches a synapse between the sensory and relay neurone.

Synapse: Synapse is a space between two neurones. The impulse travels across it by releasing neurotransmitters which allows electrical conductivity thus allowing the impulse to cross the gap.

Relay Neurone: is situated in the spinal cord. This relays the message to the brain where the information is processed and and a response is released by an impulse. This impulse is relayed by the relay neurone to the motor neurone.(Does cross a synapse but has already been explained above!)

Motor Neurone: recieves the impulse from the relay neurone and is attached to a effector. The impulse is transferred to the effector.

Effector: the effector recieves the impule from the motor neurone and causes a reaction to occur. Effectors include glands and even muscle and the impulse could be just for the muscles to contract and remove itself from the danger for example if you have your hand over a flame, your hand removes it instantly!!!

Next i'll explain to you the structure of a neurone. Here is a link below which i will refer to when explaining the different parts of the neurone:

http://webspace.ship.edu/cgboer/neuron.gif

Dendrites: These are many extensions which often look like branches or spikes which extend from the cell body. These dendrties recieve infromation from other neurones in the form of a impulse.

Cell Body: Contains a nucleus which contains genetic information in the form of chromosomes. This part of the neurone is literally the brain of the cell and doesn't have much to do with the neurone.

Axon: The purpose of the axon is to transmit an electro-chemical signal to other neurons, sometimes over a very long distances.

Myelin sheath: Some axons which are very long are insulated by many fatty acids called a myelin sheath. These wrap around the axon many times to act as a insulator and prevent any loss of the impulse.

Axon ending: Is just what it says. It is the ending of the axon. This is where it will transmit its impulse to other neurones.

And that really is all you need to know about the nervous system i think!

Hope i helped!!!

Answered Sun 20th May, 2012 @ 13:02 by Braniac
Edited by Braniac on Sun 20th May, 2012 @ 13:03
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thank you so much

that really helped  :d

Answered Sun 20th May, 2012 @ 13:20 by kiran98
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:D

Answered Sun 20th May, 2012 @ 13:21 by kiran98