negative feedback

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Tamaroshka
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negative feedback

Post by Tamaroshka » Fri Nov 13, 2009 11:31 pm

Can anyone explain for me how negative feedback mechanisms operate to regulate blood volume and urine output??

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mith
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Post by mith » Sat Nov 14, 2009 1:06 am

you pee when you have too much blood
Living one day at a time;
Enjoying one moment at a time;
Accepting hardships as the pathway to peace;
~Niebuhr

Tamaroshka
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Post by Tamaroshka » Sat Nov 14, 2009 7:13 am

this question was in my examand i didnt know how to answer it ,,,, so if i were in the exam i should write that answer!!? thanks anyways

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jwalin
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Post by jwalin » Sun Nov 15, 2009 4:29 am

basically what happens is that the brain senses the high amounts of water in blood and as a result gives an output that will result in reduction of the amount of water in blood (that is why it is called negative feedback). this output is by stopping the release of antidiuretic hormone (ADH) and an increase in the urine output
it isn't what you do that matters but it is how you do it

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jwalin
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Post by jwalin » Sun Nov 15, 2009 4:31 am

ever wondered of an example of a positive response?
it isn't what you do that matters but it is how you do it

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jwalin
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Post by jwalin » Sun Nov 15, 2009 4:33 am

an example would be
if the air is full of CO2 then the CO2 in the blood will increase. this will lead to a signal to increase the rate of respiration and as a result the amount of CO2 in blood will increase
it isn't what you do that matters but it is how you do it

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jwalin
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Post by jwalin » Sun Nov 15, 2009 4:33 am

positive feedback never helps maintain balance.
it isn't what you do that matters but it is how you do it

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Post by Tamaroshka » Sun Nov 15, 2009 3:35 pm

yeah thanks alot i just got it know :D

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JackBean
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Post by JackBean » Mon Nov 16, 2009 6:22 am

jwalin: first study and than speak ;) There are plenty of positive feedbacks ;) E.g. in calcium sensing, the small amount of calcium released causes more and more release by activation of the canal
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.

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jwalin
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Post by jwalin » Mon Nov 16, 2009 8:37 am

that is rude
never mind.
but i never said that there are no positive feedbacks.
gave an example of the CO2 one as it helps understand better.
it isn't what you do that matters but it is how you do it

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jwalin
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Post by jwalin » Mon Nov 16, 2009 8:39 am

could have given examples of the clotting system or the contraction during childbirth or eostrogen release during the follicle phase in menstrual cycle.
it isn't what you do that matters but it is how you do it

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jwalin
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Post by jwalin » Mon Nov 16, 2009 8:41 am

and many more.
but anyways positive feedback never helps maintain constant balance of the parameter it controls.
it isn't what you do that matters but it is how you do it

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