What is the term for the process by which cells maintain a stable internal environment?

• A. Adaptation
• B. Metabolism
• C. Homeostasis
• D. Growth

Answer: (C)

The process by which cells maintain a stable internal environment is known as homeostasis. This refers to the mechanisms that organisms use to regulate their internal conditions, such as temperature, pH, and the concentration of ions and nutrients, regardless of external changes. Homeostasis is crucial for the proper functioning of cells and the overall health of an organism.

Cells achieve homeostasis through various feedback mechanisms, including negative and positive feedback loops, which allow them to respond dynamically to fluctuating conditions and maintain equilibrium. For instance, when body temperature rises, mechanisms such as sweating are activated to cool the body down, whereas if it drops, shivering helps generate heat.

In contrast, adaptation refers to long-term evolutionary changes that organisms undergo in response to environmental pressures, metabolism encompasses the biochemical processes that occur within living organisms to maintain life, and growth pertains to the increase in size or mass of an organism. These concepts are related but do not specifically define the process of maintaining a stable internal environment like homeostasis does.