Define homeostasis.

Define homeostasis.

• A. Maintenance of constant conditions in the body's internal environment.
• B. A dynamic state of fluctuation with no stable set point.
• C. The process of tissue repair after injury.
• D. A temporary alteration in function due to stress.

Answer: (A)

Homeostasis is the maintenance of relatively constant internal conditions in the body, despite changes outside. The body uses sensors, a control system, and effectors to keep variables like temperature, pH, glucose, and fluid balance within a normal range. This is a dynamic process driven mainly by negative feedback: when a value drifts away from its set point, responses are triggered to counteract the change and restore balance. For example, if body temperature rises, cooling mechanisms activate; if it drops, warming mechanisms activate. These small fluctuations occur within a stable range, rather than a complete absence of regulation or a permanent change. Tissue repair or a temporary stress-induced change do not describe homeostasis themselves; healing is a separate process, and stress can transiently alter function but the goal of homeostasis is to restore stability.

Homeostasis is the maintenance of relatively constant internal conditions in the body, despite changes outside. The body uses sensors, a control system, and effectors to keep variables like temperature, pH, glucose, and fluid balance within a normal range. This is a dynamic process driven mainly by negative feedback: when a value drifts away from its set point, responses are triggered to counteract the change and restore balance. For example, if body temperature rises, cooling mechanisms activate; if it drops, warming mechanisms activate. These small fluctuations occur within a stable range, rather than a complete absence of regulation or a permanent change. Tissue repair or a temporary stress-induced change do not describe homeostasis themselves; healing is a separate process, and stress can transiently alter function but the goal of homeostasis is to restore stability.