Human Anatomy, Physiology, and Medicine. Anything human!
can some one please help me im taking A&P 1 for the first time and i dont understand nothing. i have an exam coming up soon and i really need to understand the difference between negative and positive feedback on homeostasis and what are some examples!!!!!!!!!!!!!!!!!!!!!!! :(
Negative feedback is when you have a change in your body which impairs homeostasis and your body corrects it. (Overheating then sweating, Sweating, then drinking)
Positive feedback is when the change is pushed farther in the altering direction. (A mild seizure progressing to status epilepticus)
Negative feedback: Compensatory stage of shock....increased heart rate to perfuse all tissues.
Positive Feedback: Decompensatory stage of shock progressing to Terminal stage of shock...heart rate gets slower and the body temp falls....etc.
Negative and positive feedback 2in1 example for homeostasis:
Regulation of ovarium cycle by FSH and LH ---> estrogen and progesteron
Try to understand this figure. It gives you all information. If you don't get the point, I'll explain it later
It would depend on the meerkat's physiological response to the sunbathing.
Heat exhaustion- Positive Feedback
Thermoregulation- Negative Feedback
As a general rule:
Negative feedback : deviation form the normal, and then back to the normal
Positive feedback : deviation from the normal, then deviation keeps increasing instead of returning to normal. (positive deviation is rather rare in nature)
An example of positive feedback are the reactions that take place in blood clotting
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter
I read about -ve and +ve feedback from books and different books gave different answers. When there is any change from the optimum condition,
1) -ve feedback will activate sequence of actions that will tend to restore the system back to normal.
2) -ve feedback is a process that inhibit a detector/regulator once conditions return to normal, thereby maintaining the stability of the system.
Which one is correct? Any help?
All of them, until the end, cause reaction activates the next and so on and so forth..
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