[Janjan]

I am a 1st term VN student and I am having a problem understanding and making a Homeostatic Grid. Does anyone know what I'm talking about? If so Pls. help.
(keywords: body function: controlled variable, sensory, afferent pathway, controller, efferent pathway, feedback and feed forward.)[

[Powerade]

Hi there,

I've added a link I scanned to an image of the reflex arc which could be an example of a homeostatic grid, or concept map which I assume are both the same.

As a starting point you could begin with a feedback loop -


1.Receptors (input) 2.Control centre (output) 3.Effectors (response) which then comes back to the receptos.

*Notes: Controlled condition = (input)

You could use, for body functions regulation of body temperature. Thermoreceptors responding to changes in temp, and responses which occur - vasodilation, vasoconstriction, shivering etc.

Also positive feedback in the process of clotting.

1. Break in blood vessel wall causes bleeding --> 2. Damaged cells release chemicals --> 3. Clotting begins

(clotting accelerates)
-positive feedback loop)
--> 4. Additional chemicals released 5. Blood clot plugs break in vessel wall; bleeding stops.

http://photobucket.com/albums/v491/g...omeostasis.jpg

[Janjan]

<font color="purple">Text</font>Thank you powerade for responding to my post. The link you gave me sort of helped me look at it a different way and was able to open up to other ideas. I'm so happy to have found this forum that I've already told my colleagues about it. I'm looking forward to using it again.

[Powerade]

That's okay. I hope the writing wasn't too small. I know I didn't include some of them keywords, though when I saw afferent pathway + efferent pathway as 2 of the key words I thought of the reflex arc straight away - I went over the diagram quite a bit when studying for my exam late Oct - early Nov.