GCSE Biology (AQA)

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Homeostasis

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Homeostasis and Response Homeostasis

Homeostasis

2:15 Homeostasis and the Nervous System
Spec 4.5.1
Previous Metabolism Next The Nervous System
  • Homeostasis refers to stable conditions within organisms and cells.
  • Examples of conditions that need to remain stable include body temperature and water levels.
  • The term "homeostasis" originates from the Greek words "homeo" (similar to) and "stasis" (stay still), meaning to maintain the same state.
  • Homeostasis involves regulating internal conditions of a cell or organism to maintain optimum conditions for function, responding to both internal and external changes.
  • Internal conditions that need regulation in the human body include glucose levels, water levels, and body temperature.
  • These conditions must stay within narrow limits, such as a few degrees Celsius for body temperature.
  • Maintaining stable conditions is crucial because cells can only survive within specific physical and chemical limits; for example, enzymes denature if the body temperature is too high.
  • Homeostasis is primarily maintained by the nervous system and the endocrine system.
  • These systems monitor and adjust the composition of blood and tissues, such as the pancreas monitoring blood glucose levels and signaling the liver to adjust glucose levels accordingly.

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