-
Best of luck to the class of 2024 for their HSC exams. You got this! Let us know your thoughts on the HSC exams here -
YOU can help the next generation of students in the community! Share your trial papers and notes on our Notes & Resources page
Neg/Pos Feedback mechanisms (1 Viewer)
- Thread starter Niksta123
- Start date
Buiboi
Member
- Joined
- Apr 24, 2006
- Messages
- 610
- Gender
- Male
- HSC
- N/A
positive and negative feedback mechanisms are what make up homeostasis.
negative feedback is when the stimulus is brought back to normal by creating internal metabolic activities that 'coutneract' with the stimulus.
eg: cold temperature, drop in body temperature, receptors detect, hypothalamus obatins info, analyses interpretes then signals effectors in muscles and glands, which creates the response- which is to shiver and erect hairs which counteract the problem as shivering helps to increase temperature and hairs trap warm air
positive is similar to the negative feedback but the internal metabolic activities dont 'counteract' but 'encourage' the response
eg, pregnant women has a baby inside right, contractions cause cramps and pain and disrupts the homoeostasis of the woman. so basically the body encourages further contractions as a means of reaching a stable state such that contractions allow the baby to get out...something like that
negative feedback is when the stimulus is brought back to normal by creating internal metabolic activities that 'coutneract' with the stimulus.
eg: cold temperature, drop in body temperature, receptors detect, hypothalamus obatins info, analyses interpretes then signals effectors in muscles and glands, which creates the response- which is to shiver and erect hairs which counteract the problem as shivering helps to increase temperature and hairs trap warm air
positive is similar to the negative feedback but the internal metabolic activities dont 'counteract' but 'encourage' the response
eg, pregnant women has a baby inside right, contractions cause cramps and pain and disrupts the homoeostasis of the woman. so basically the body encourages further contractions as a means of reaching a stable state such that contractions allow the baby to get out...something like that
K
katie_tully
Guest
Negative Feedback eg:
Dehydration --> lowers blood volume, increases plasma osmolality --> osmoreceptors in the hypothalamus has two effects: ADH secretion and thirst --> thirst results in drinking --> increased water uptake, increased water retention which then stops the release of ADH and the feeling of thirst.
Dehydration --> lowers blood volume, increases plasma osmolality --> osmoreceptors in the hypothalamus has two effects: ADH secretion and thirst --> thirst results in drinking --> increased water uptake, increased water retention which then stops the release of ADH and the feeling of thirst.
Positive feedback systems increase the effect of whatever is being monitored. ie if the thing being monitored increases the feedback mechanism increases it futher or if the thing being monitored decreased the feedback mechanism decreases it futher.
Negative feedback systems are what help keep homeostasis because they counteract changes rather than amplifing them like positive feedback systems. ie with neg feedback systems if something increases the feedback mechanism will reduce it. examples include temperature control, glucose control and water balance.
Negative feedback systems are what help keep homeostasis because they counteract changes rather than amplifing them like positive feedback systems. ie with neg feedback systems if something increases the feedback mechanism will reduce it. examples include temperature control, glucose control and water balance.