Saturday, January 16, 2010

Is it a positive or a negative feedback control system?

when we become dehydrated, we usually fell thirsty which causes us to drink fluids. so which feedback is this?


i think it's a positive feedback, if you think it's a negative, plz say why, thank you guys!Is it a positive or a negative feedback control system?
Negative feedback loop! Basically, with feedback loops, you've gota receptor, a control center, and an effector. In your scenario of becoming dehydrated, let's say that you've been out in the sun for a long time and your body is losing water because of it. Your body knows how much water it should have and notices that it's getting kind of low. Your body detects the difference and, therefore, is the receptor in this case. The receptor (your body) will now send a signal to the control center (the brain) to let it know that the body needs water. The control center (brain) then sends an order to the effector to produce a response to the threat of being low on water. The effector does this by producing the feeling of thirst. Then you drink water and, after a short time, everything is normal again. A good example of a positive feedback loop is childbirth. Actually, most of the feedback loops in the body are negative feedback loops. Positive feedback loops, like labor and childbirth, just keep prodicing and increasing output from the control center (usually the brain, but not always) sending signals to the effector to keep producing responses without stopping. Think of a positive feedback loop as a thermostat. It gets hot in the room and the thermostat kicks on and begins to cool the room off. The temperature reaches a perfect degree, but it still keeps working and cooling the room off even more. Now it's really cold in there, but the thermostat keeps running cold. It eventually gets to the point where you need to break the thermostat or leave the room because it's so cold.Is it a positive or a negative feedback control system?
thankyou sooooooooooooooooooooooooooooo鈥?much.

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