Homeostasis is the process by which living organisms maintain a stable internal environment despite changes in external conditions. This balance is crucial for the proper functioning of cells and overall health. For example, the human body regulates temperature, pH levels, and hydration to ensure that vital processes can occur efficiently. Various systems work together to achieve homeostasis. In humans, the nervous system and endocrine system play key roles by sending signals and hormones to adjust bodily functions. When a person gets too hot, for instance, the body sweats to cool down, demonstrating how homeostasis helps maintain optimal conditions for survival.