chuinhen Posted October 1, 2006 Share Posted October 1, 2006 generally , we said that hormone travels to the target organ via blood stream n a slower transfer speed MY question is :: why is the effect of adrenaline is so fast once we fear ????? Link to comment Share on other sites More sharing options...
insane_alien Posted October 1, 2006 Share Posted October 1, 2006 it affects the brain and is produce IN the brain. there are also various glands about the body that produce it also so the physiological effects come about faster than usual. just good distribution and evolution is all. Link to comment Share on other sites More sharing options...
Mokele Posted October 1, 2006 Share Posted October 1, 2006 Um, adrenaline is not produced in the brain, it's produced in the adrenal glands on top of the kidneys. As to why it affects us so fast, my guess would be that it gets dumped right into one of the major veins coming from the kidney (a *lot* of blood goes through the kidneys), from there to the heart, and from there to everywhere. Mokele Link to comment Share on other sites More sharing options...
insane_alien Posted October 1, 2006 Share Posted October 1, 2006 i thought there as a small gland in the brain that also produce small amounts? no wonder i din't do biology... Link to comment Share on other sites More sharing options...
SkepticLance Posted October 1, 2006 Share Posted October 1, 2006 'Slower' is a relative term. It is only a matter of seconds from adrenal gland to brain. In the mean time, you have just had a severe fright. Your brain is in overdrive. You do not notice that adrenaline has not yet kicked in. When it does, it seems to be just a part of the total reaction. Link to comment Share on other sites More sharing options...
The_simpsons Posted October 25, 2006 Share Posted October 25, 2006 isn't adrenaline besides being a hormone, a neurotransmittor too(at least noradrenaline is, sympathomimetic)? Link to comment Share on other sites More sharing options...
GutZ Posted October 25, 2006 Share Posted October 25, 2006 If we had slow adrenaline, God (Creator, Evolution, whatever) is a real comedian. Link to comment Share on other sites More sharing options...
aj47 Posted October 25, 2006 Share Posted October 25, 2006 isn't adrenaline besides being a hormone, a neurotransmittor too(at least noradrenaline is, sympathomimetic)? Yes like Noradrenaline, Adrenaline/Epinaphrine can act as both although IIRC the fight or flight response is only stimulated through it's action as a hormone. Link to comment Share on other sites More sharing options...
blike Posted October 25, 2006 Share Posted October 25, 2006 The_simpsons is right, norepinephrine is both a hormone and a neurotransmitter. Norepinephrine is released from nerve terminals as soon as the signal is sent (sympathetic autonomics), thus the response is virtually instantaneous. Most of the circulatory norepinephrine is spillover from sympathetic nerve endings, rather than from the adrenal medulla. The adrenal medulla is mostly geared towards epinephrine release (though something like 20% is norepi). During sympathetic stimulation, the adrenal medulla releases predominantly epinephrine, but the immediate affect is from the instantaneous release of norepi from nerve terminals. Hope that helps. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now