Final answer:
Negative feedback loops are used to control body homeostasis by maintaining stability in physiological conditions. They help regulate variables like body temperature, blood glucose level, and pH within a narrow range.
Step-by-step explanation:
Negative feedback loops are used to control body homeostasis because they help maintain stability in physiological conditions. In a negative feedback loop, a stimulus triggers a response that acts to reverse the initial stimulus, bringing the body back to its normal state. This helps keep variables such as body temperature, blood glucose level, and pH within a narrow range.
For example, in the regulation of body temperature, if the internal temperature rises above the set point, the body activates mechanisms to cool down, such as sweating and vasodilation. On the other hand, if the temperature drops below the set point, mechanisms like shivering and vasoconstriction are activated to generate heat and raise the temperature.
Negative feedback loops are essential for maintaining homeostasis and ensuring that the body's internal environment remains stable and functional.