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.
2 [Labor Vs.] | Skilled Labor Vs. The terms blue collar and white collar are occupational classifications that distinguish workers who perform manual labor from workers who perform professional jobs. Historically, blue-collar workers wore uniforms, usually blue, and worked in trade occupations.