After about an hour of basking in the sun, the body temperature of the marine iguana reaches 37°C, and the animal dives into the water to feed. In the water, its body temperature rapidly drops, and the iguana must return to the rocks to warm up. This process is an example of

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Negative feedback is a process in which a response to a stimulus results in the opposite effect in order to maintain homeostasis. In this case, the increase in body temperature from basking in the sun triggers a response to cool down by jumping into the water. However, the sudden drop in temperature triggers a response to warm back up by returning to the rocks. This process helps the marine iguana maintain a stable body temperature within a certain range.

After About an Hour of Basking in the Sun, the Body