Final answer:
The secretion of insulin in response to high blood glucose levels is an example of a negative feedback loop, which acts to lower the glucose levels and maintain homeostasis.
Step-by-step explanation:
When blood glucose levels rise, the body secretes insulin as a regulatory mechanism to lower these levels. This is an example of a negative feedback loop, where the response to a stimulus leads to an effect that counteracts or reduces the original stimulus.
Insulin facilitates the uptake of glucose into cells and the storage of excess glucose as glycogen in the liver, which helps to return blood glucose levels to a normal range. If blood glucose levels become too low, glucagon is released to raise them, maintaining homeostasis.