Negative Feedback

In a negative feedback system some factor, such as blood pressure, changes. The change is detected by a sensor. The sensor sends a message to an integrating center which in turn stimulates an effector. The effector will do something to alter the factor that changed.
In the example to the right blood pressure has increased. Receptors in the carotid arteries detect the change in blood pressure and send a message to the brain. The brain will cause the heart to beat slower and thus decrease the blood pressure. Decreasing heart rate has a negative effect on blood pressure.
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