Which term best describes maintaining a stable internal environment?

Which term best describes maintaining a stable internal environment?

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

Answer: (A)

Maintaining a stable internal environment is described by homeostasis. The body continuously monitors variables like temperature, pH, and glucose levels and uses feedback mechanisms to keep them within narrow limits, even as external conditions change. This is a dynamic balancing act, often driven by negative feedback, where sensors detect a deviation and effectors bring conditions back toward the set point, ensuring cells function optimally. Metabolism is the sum of all chemical reactions that provide energy and build or break down materials; it explains how the body processes nutrients, not how it keeps internal conditions stable. Respiration refers to gas exchange and cellular energy production using oxygen; it’s part of energy metabolism rather than a term for regulation of internal conditions. Growth means an increase in size or number of cells, a developmental process rather than the regulation of internal stability. So, the term that best describes keeping the internal environment steady is homeostasis.

Maintaining a stable internal environment is described by homeostasis. The body continuously monitors variables like temperature, pH, and glucose levels and uses feedback mechanisms to keep them within narrow limits, even as external conditions change. This is a dynamic balancing act, often driven by negative feedback, where sensors detect a deviation and effectors bring conditions back toward the set point, ensuring cells function optimally.

Metabolism is the sum of all chemical reactions that provide energy and build or break down materials; it explains how the body processes nutrients, not how it keeps internal conditions stable. Respiration refers to gas exchange and cellular energy production using oxygen; it’s part of energy metabolism rather than a term for regulation of internal conditions. Growth means an increase in size or number of cells, a developmental process rather than the regulation of internal stability.

So, the term that best describes keeping the internal environment steady is homeostasis.