Worked example
In a model of temperature regulation, an animal’s body cools below its usual range. Temperature sensors signal a response, and shivering increases heat production. If temperature rises toward the usual range, the need for shivering decreases. The response changes the same condition that triggered it.
Contrast and common error
A sensor can work even when its response pathway fails. If muscles cannot produce additional heat, a cold signal by itself may not restore temperature. An amplifying loop differs in direction: a triggered response moves the condition farther from its starting range.
Transfer check
A model gland releases a signal when a quantity is too high. The signal reduces the quantity. What should happen to the original drive for release as the quantity returns toward normal? Check: it should diminish under the model because the upward deviation becomes smaller.
Try it, then explain it.
Complete a short set without looking at the example. After each answer, explain which evidence or rule supports your decision and why the alternatives do not fit.
Sources & authorship
Original OpenExam explanations and examples. References support the concepts; they are not the source of copied questions. Independent educator review is pending.
OpenStax Biology 2e 33.3 Homeostasis