negative feedback mechanisms

[micatronic]

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from the syllabus:
gather, process and analyse information from secondary sources and use available evidence to develop a model of a feedback mechanism

im a bit stuck for ideas on this one.:worried:
id like to know examples of what other people have used for their models please
after all, they say the best way to make sure you know something is to explain/teach it to others

thanks,
mica.

[georgechah1]

in humans only

temp increases(thermoreceptors)------feedback--------->hypothalamus(control centre)--------negative feedback---------------------------->sweat glands(afffector)(secret sweat)---------.temp decreases(back to set value approx 37C)

[sunlightstarz]

A fairly good model is that of a thermostat, say in your fridge. When the temperature rises above the set level, the thermostat signals cooling to begin. When the temperature drops below the set level, the thermostat signals for cooling to cease. Similarly, the hypothalamus in the human brain signals for cooling mechanisms (e.g. vasodilation, perspiration, decreased adrenaline, etc.) to occur when the body temperature is too high, and vice versa. Hope that helps!

[Lachycharts]

Originally Posted by georgechah1

in humans only

temp increases(thermoreceptors)------feedback--------->hypothalamus(control centre)--------negative feedback---------------------------->sweat glands(afffector)(secret sweat)---------.temp decreases(back to set value approx 37C)

Made this:




I know this thread is old, but it helped me - so hopefully this helps some people too.

[yalando]

Blood sugar levelsStimuli- High/ Low blood sugar levels. Receptors- Alpha/beta cells in the bloodHigh levels (eating a sugary meal) - message sent to hypothalmus- message sent along Periphal nervous system to tell the (RESPONE) pancreas to secrete insulin- Excess glucose stored as glycagon in liver OR increase in cellular respirationLow level (fasting or excercise) - beta cells are the receptors- message sent to Hypothalamus- RESPONSE: pancreases secretes hormone glucagon which stops insulin - glucagon tells liver to break down glycagon into usable glucose Both then return the body to homeostasis I normal blood glucose levels. FIve steps- Receptors-sensory organsHypothalamusMotor neuronsEffect/response