Examples of homeostasis include the regulation of body temperature, the pH of extracellular fluid, or the concentrations of sodium, potassium and calcium ions as well as that of glucose in the blood plasma, despite changes in the environment, diet, or level of activity.
Blue-collar workers perform labor jobs and typically work with their hands. The skills necessary for blue-collar work vary by occupation. Some blue-collar occupations require highly skilled personnel who are formally trained and certified.
Computer workers may be exempt under any of the white collar exemptions, as bona fide executive or administrative employees. (See, FLSA Coverage.) For example, a network administrator may be performing administratively exempt job duties.