How to Activate an LG 290C. Once you get a Straight Talk phone, you have to activate it. Itâs a pretty simple to do online, but you may find it useful to see an actual example â in this case a Straight Talk LG290C.ow to Activate an LG 290C. Once you get a Straight Talk phone, you have to activate it. Itâs a pretty simple to do online, but you may find it useful to see an actual example â in this case a Straight Talk LG290C.
Best example of positive feedback is the release of oxytocin during childbirth. Oxytocin is a reproductive hormone in females. Though it is also secreted in males, its function is yet unclear.
The control of blood sugar (glucose) by insulin is another good example of a negative feedback mechanism. When blood sugar rises, receptors in the body sense a change. In turn, the control center (pancreas) secretes insulin into the blood effectively lowering blood sugar levels.he control of blood sugar (glucose) by insulin is another good example of a negative feedback mechanism. When blood sugar rises, receptors in the body sense a change. In turn, the control center (pancreas) secretes insulin into the blood effectively lowering blood sugar levels.