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.
How a Protective Collar Works. A protective collar consists of a put option purchased to hedge the downside risk on a stock, plus a call option written on the stock to finance the put purchase. Another way to think of a protective collar is as a combination of a covered call plus long put position. The put and call are typically out-of-the-money (OTM) options, but have the same expiration and ideally are for the same number of contracts (equivalent to the number of shares held).