Homeostasis, a unifying principle of biology, refers to the body’s ability to maintain a constant internal environment in response to environmental changes. If the body was unable to maintain a constant internal environment, cells would lose their ability to carry out normal functions. For example, when we consume different foods or drinks, our body essentially maintains a constant pH or when we are exposed to cold weather, the body regulates body temperature in an effort to maintain an internal temperature of around 98.6F. In addition to body temperature and pH, homeostasis also maintains the body’s blood pressure. In humans, the cardiovascular system allows for the exchange between cells and the external environment by transporting blood
