When the temperature in a room drops too low,the thermostat senses it and the furnace turns on.Once the temperature rises to a predetermined level,the furnace turns off.This is analogous to the way sex hormone levels operate on a

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A negative feedback system operates to maintain a certain level of a variable within a set range. When the variable deviates from the set range, the system responds in a way that brings it back to the set range. In this analogy, the temperature in the room is the variable, and the thermostat and furnace are the feedback system that works to maintain the temperature within a set range. Similarly, sex hormone levels are regulated by negative feedback systems in the body. If hormone levels get too high or too low, the body responds to bring them back to a normal range.

When the Temperature in a Room Drops Too Low,the Thermostat