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.
Collar (clothing) - Types of collars. 1  Collars can be categorized as... 2  Standing or stand-up, fitting up around the neck and not lying on the shoulders. 3  Turnover, standing around the neck and then folded or rolled over. 4  Flat or falling, lying flat on the shoulders.