Final answer:
Negative feedback loops are used to regulate body homeostasis, like body temperature. Diabetes is a condition that exemplifies the failure of a set point in humans.
Step-by-step explanation:
Negative feedback loops are used to regulate body homeostasis by resisting a deviation from the set point and returning the body to its normal range. For example, body temperature is regulated by negative feedback. If body temperature rises above the set point, physiological processes such as sweating are activated to cool the body down and bring temperature back to normal.
Diabetes is a good example of the failure of a set point in humans. In diabetes, the body is unable to properly regulate blood glucose levels, leading to either high blood sugar (hyperglycemia) or low blood sugar (hypoglycemia). This is due to a failure of insulin, the hormone responsible for regulating glucose levels, to function properly.