How did Claude Bernard’s discoveries help explain homeostasis?

Claude Bernard’s research was foundational to the concept of homeostasis, which he described as the maintenance of a stable "internal environment" despite fluctuations in external conditions.12

His discoveries provided specific physiological evidence for this self-regulating process:

• Glycogenic function of the liver: Bernard discovered that the liver stores glycogen, which the body can break down into sugar as needed. This mechanism ensures that the blood sugar level remains constant, demonstrating how the body builds and manages internal reserves to maintain stability.2
• Vasomotor nerve regulation: He identified that vasomotor nerves control the constriction and dilation of blood vessels. By adjusting blood flow in response to environmental temperatures—such as constricting vessels to conserve heat in the cold or expanding them to dissipate heat in the warmth—the body actively regulates its internal state.2

These findings moved physiology beyond earlier theories, establishing that organisms possess active, integrated mechanisms to sustain vital processes within a prescribed, stable range.12