Which of the following is an example of homeostasis in the human body?

• A. Sweating to help lower body temperature when you are overheated
• B. An increase in heart rate during exercise to deliver more oxygen to muscles
• C. Cellular respiration producing ATP from glucose in mitochondria
• D. Digestive enzymes breaking down starch into simple sugars in the small intestine

Answer: (A)

Verified step by step guidance

1. Understand the concept of homeostasis: Homeostasis is the process by which the body maintains a stable internal environment despite changes in external conditions.
2. Identify the options that involve maintaining internal balance: Look for examples where the body responds to a change to keep conditions within a normal range.
3. Analyze 'Sweating to help lower body temperature when you are overheated': Sweating is a response to increased body temperature that helps cool the body down, maintaining temperature homeostasis.
4. Consider 'An increase in heart rate during exercise to deliver more oxygen to muscles': This is a physiological response to meet increased demand but is more about meeting energy needs than maintaining a constant internal environment.
5. Evaluate the other options: Cellular respiration and digestion are ongoing metabolic processes, not direct examples of homeostasis because they do not specifically regulate internal conditions in response to change.