Group+9

__There are two feedback mechanisms that control endocrine function.__
 * POSITIVE FEEDBACK || NEGATIVE FEEDBACK ||
 * || regulation of the blood calcium levels ||
 * || Negative feedback regulates the discharge of almost every hormone. ||

>> Negative feedback mechanisms act like a thermostat in the home. As the temperature rises (deviation from the ideal normal value), the thermostat detects the change and triggers the air-conditioning to turn on and cool the house. Once the temperature reaches its thermostat setting (ideal normal value), the air conditioning turns off > An example of positive feedback can be found in childbirth. The hormone oxytocin stimulates and enhances labor contractions.
 * The two types of feedback mechanisms are negative feedback and positive feedback. Negative feedback decreases the deviation from an ideal normal value, and is important in maintaining homeostasis. Most endocrine glands are under the control of negative feedback mechanisms.
 * An example of negative feedback is the regulation of the blood calcium level.
 * Positive feedback mechanisms control self-perpetuating events that can be out of control and do not require continuous adjustment. In positive feedback mechanisms, the original stimulus is promoted rather than negated. Positive feedback increases the deviation from an ideal normal value. Unlike negative feedback that maintains hormone levels within narrow ranges, positive feedback is rarely used to maintain homeostatic functions.

Endocrine Systems and Feedback Cycles
The endocrine system uses cycles and negative feedback to regulate physiological functions. Negative feedback regulates the secretion of almost every hormone. Cycles of secretion maintain physiological and homeostatic control. These cycles can range from hours to months in duration.