Shivering is an involuntary muscular response from the body, triggered by cold. The "shivering" muscles are trying to internally generate heat, to help keep you warm.
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sweating and shivering
Shivering to produce heat, goosebumps, blood capillaries narrowing.
Shivering occurs under various circumstances. The one which occurs during cold is basically meant to provide heat to your body by friction. The muscular activity causes respiration which also produces heat. Its body's mechanism of generating heat to maintain its temperature. The other cause can be a malarial infection in which it occurs usually during the evening time when the plasmodium bursts the infected RBCs in blood to invade other RBCs of blood. It might occur in state of fear or tension which occurs due to adrenaline or nor-adrenaline hormone as the case may be as the muscles are tensed up for fight or flight
Completely devoid of fuel, she collapsed in a shivering heap and was unable to mine any more diamonds.
Yes it is because by shivering, your body is trying to maintain its body temperature which is in turn its internal homeostasis.