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.
Blue collar jobs are any type of employment situations that involve manual labor that is compensated with an hourly wage rather than a salary. There are a number of different types of jobs that fall into this category, many of which provide a steady and attractive amount of income. Some of the more common examples of blue collar jobs are found in construction, mechanical repairs, plumbing, and electrical work. When many people think of blue collar jobs, the image of a worker in a manufacturing plant often comes to mind.