Final answer:
Shivering is the body's physiological effort to maintain core body temperature by generating heat through muscle contractions.
Step-by-step explanation:
Shivering is a physiological effort to maintain core body temperature. When the body temperature drops below the set point, the hypothalamus in the brain triggers the shivering reflex. Shivering causes the muscles to contract and release heat energy, which helps to elevate the body temperature. It is an involuntary response that helps the body maintain homeostasis.