Homeostasis

Homeostasis is a state of balance inside the body, where the body systems work together to keep it functioning normally. The endocrine system keeps this internal balancing act going by releasing chemicals called hormones. The release of the hormones is controlled by negative feedback mechanisms.

A negative feedback mechanism works something like a thermostat in your home. A thermostat helps maintain a constant temperature. Think of that as the normal range. When the temperature rises beyond the normal range, the thermostat turns on the air conditioner. Eventually the air conditioner restores the temperature to the normal range. That’s negative feedback. It starts with a normal range, goes beyond the normal range, and then back to normal again.

Now, let’s look at how this mechanism works in the body.

One example is how the endocrine system controls the amount of sugar in the bloodstream. Insulin is a hormone secreted by the pancreas that maintains a normal amount of sugar in the bloodstream. Shortly after eating a candy bar, tiny sugar molecules enter the bloodstream raising the blood sugar levels. In response, the pancreas secretes the insulin into the bloodstream. Now, the sugar molecules move out of the bloodstream and into the cells of the skeletal muscles, fat and liver. In turn, the blood sugar levels return to normal.

That’s how a negative feedback mechanism works to maintain the body’s internal balance.

Review Date:11/2/2021
Reviewed By:David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

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