If the oxygen level in the blood decreases, the brain sends a message to the lungs/diaphragm to breathe faster, which increases the levels of oxygen in the blood.  This describes a negative or positive feedback loop.

Concepts of Biology
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ISBN:9781938168116
Author:Samantha Fowler, Rebecca Roush, James Wise
Publisher:Samantha Fowler, Rebecca Roush, James Wise
Chapter16: The Body's System
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Problem 6RQ: When faced with a sudden drop in environmental temperature, an endothermic animal will _______. a....
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If the oxygen level in the blood decreases, the brain sends a message to the lungs/diaphragm to breathe faster, which increases the levels of oxygen in the blood.  This describes a negative or positive feedback loop.

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