16. What is an example of a stimulus that triggers a homeostatic system?
Answer: C
Increased blood sugar levels after a meal is an example of a stimulus that triggers a homeostatic system.
Homeostasis refers to the body's mechanisms that maintain a stable internal environment. Increased blood sugar levels after a meal serve as a stimulus that triggers the release of insulin, a hormone that helps regulate glucose levels in the bloodstream.
A) Increased sweating on a hot day
Increased sweating on a hot day is a response to elevated body temperature, which is a part of the thermoregulation process, but it does not directly pertain to the regulation of blood sugar levels. This option illustrates a different homeostatic mechanism related to temperature regulation rather than glucose homeostasis.
B) Higher heart rate after activity
A higher heart rate after physical activity is an example of the body's response to increased demand for oxygen and nutrients during exercise. This response relates to cardiovascular homeostasis, not the regulation of blood sugar levels, making this option incorrect in the context of the question.
C) Increased blood sugar levels after a meal
Increased blood sugar levels after a meal trigger the homeostatic system to maintain glucose levels, primarily through the secretion of insulin. This response is crucial for regulating energy balance and is a direct example of a stimulus that activates a homeostatic process.
D) Secretion of insulin
While the secretion of insulin is a crucial response to elevated blood sugar levels, it is not itself a stimulus; rather, it is part of the response to a stimulus. Therefore, this option, although related to the concept of homeostasis, does not correctly answer the question regarding what acts as a stimulus.
Conclusion
Increased blood sugar levels after a meal is the definitive example of a stimulus that triggers a homeostatic system, as it prompts the release of insulin to help maintain glucose balance in the body. The other options either refer to different homeostatic processes or describe responses rather than stimuli, thus failing to address the question accurately.