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.
DEFINITION of 'White Collar'. A working class that is known for earning high average salaries and not performing manual labor at their jobs. White collar workers historically have been the shirt and tie set, defined by office jobs and not getting their hands dirty (or their white collar dress shirts). This class of worker stands in contrast to blue collar workers, who traditionally wore blue shirts and worked in plants, mills and factories. Next Up.
Blue Collar. What is a 'Blue Collar'. A blue collar is a working-class person historically defined by hourly rates of pay and manual labor. A blue collar worker refers to the fact that most manual laborers at the turn of the century wore blue shirts, which could hold a little dirt around the collar without standing out.