"Homeostasis" is the ability of the body to regulate itself in order to maintain a steady state. This includes mechanisms that allow automatic adjustment when the need for it arises. <em>Covering ourselves with a blanket, taking a shower and turning on the air-conditioner </em>are "not self-regulated" activities because they are done "intentionally" by the person. It is only "shivering" that shows the<em> body's regulation of heat.</em>
When the environment is cold, the skeletal muscles of the body respond by rapidly<u><em> contracting and relaxing</em></u>. This is what you call as <em>"shivering."</em> It produces heat through<em> "respiration." </em>Thus, it helps increase the body temperature.