Login

Join for Free!
116975 members


Nerve Impulses

Debate and discussion of any biological questions not pertaining to a particular topic.

Moderator: BioTeam

Nerve Impulses

Postby Bio_Girl015 » Fri Apr 21, 2006 5:44 pm

How does a light touch stimulate a nerve impulse?How does it travel to the brain?Where in the brain is the impulse recieved? :?: I am a bit confused. Please explain the process to me. Thank you in advance.
Guitarist, Swimmer, and College Student
Bio_Girl015
User avatar
Bio_Girl015
Death Adder
Death Adder
 
Posts: 52
Joined: Thu Apr 13, 2006 11:17 pm
Location: Miami,Fl

Postby Khaiy » Fri Apr 21, 2006 6:44 pm

When you are touched (enough for you to feel, anyway), the nerves in that area of your body are compressed. These nerves respond to compression. Voltage gated ion channels, located on the axon, open up. Sodium ions (positively charged) rush in through the suddenly open channels, attracted by the negative charge present inside the axon itself, leading to depolarization of the area immediately around the channel. Depolarization of one section of the axon stimulates the opening of other voltage gated ion channels, and as a result there is rapid depolarization across the axon.

Once this depolarization reaches the dendrite (main body of the nerve cell), a signal is released into a synapse (the space between one nerve cell and another). The second nerve cell recieves this signal, and passes it on to the next nerve, and then the next, and so on until the signal reaches the brain.

I don't know which part of the brain recieves the signal off the top of my head (maybe the hypothalamus?). But once the signal is recieved, the brain translates it into a feeling for you, in your light touch example perhaps a tickle. The brain can send a signal back down a different set of nerve cells, stimulating a response (like trying to get away from whatever is tickling you). Nerves only go one way, either from somewhere to the brain, or from the brain to somewhere.

That's the process as I understand it, but I could have made a mistake here and there. If I have, someone please point it out (it's been a while since my last physiology class :P).
User avatar
Khaiy
Coral
Coral
 
Posts: 158
Joined: Tue Feb 28, 2006 2:37 am

Postby Bio_Girl015 » Sat Apr 22, 2006 6:27 pm

Thanks Khaiy! I get it now. Peace.
Guitarist, Swimmer, and College Student
Bio_Girl015
User avatar
Bio_Girl015
Death Adder
Death Adder
 
Posts: 52
Joined: Thu Apr 13, 2006 11:17 pm
Location: Miami,Fl



Return to General Discussion

Who is online

Users browsing this forum: No registered users and 7 guests

cron