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.
âThe second wave of outsourcing, which began in the 1990s, threatens white-collar service and information technology jobs.â âBy the following year it had grown to 60,000 members - mainly white-collar workers and professionals.â âSuits and ties are symbols of white-collar jobs.â