Which statement about homeostasis is correct?

• A. Homeostasis is the maintenance of stable internal conditions.
• B. Homeostasis is the process of digestion.
• C. Homeostasis is the production of energy.
• D. Homeostasis is the movement of proteins.

Answer: (A)

Homeostasis is about keeping the body's internal environment stable and within a range that allows cells and enzymes to function properly. The body constantly monitors variables like temperature, pH, fluid balance, and glucose levels, and uses sensors, control centers, and effectors to adjust processes when things drift away from the set point. This balancing act is typically achieved through negative feedback: if a value goes up, responses act to bring it down; if it goes down, responses raise it back up. This ongoing regulation is what keeps internal conditions stable despite changes outside.

So the statement that homeostasis maintains stable internal conditions best captures what this process is and why it’s important. The other options describe different biological processes—digestion is breaking down food, energy production refers to metabolic pathways like cellular respiration, and the movement of proteins relates to transport or cellular mechanics—not to regulating internal conditions.