The Physics Of fever-Why fever?

The Physics Of fever
1.Why fever?

When the body or its parts are affected with some fatigue, it undergoes a self defence mechanism that allows it to take rest and prevent the heat from deterioration.
To prevent loss of heat from the body, heat is kept in different planes. It can be understood in a simple manner as the inner heat and the outer heat. The internal heat of the body or a part of it may decrease due to physiological, mental and circumstantial reasons. For maintaining proper health, a certain level of heat is mandatory. If the heat decreases than a certain level, it is fatal for the organ or the body and there is a threat for even life. So when we lose heat, body will watch it till a limit and then will initiate its life saving act. As per the "law of thermodynamics" heat preserves heat. To avoid further loss from the existing heat of the body, rest is necessary. Body achieves rest, by making many difficulties for the normal functioning.
Here body try to generate heat in the peripheries in different methods.
1. Heart beat is increased. But the blood vessels are shrinked to offer more resistance to the flow to generate heat there.
2. Respiration rate is increased.
3. The muscles start shivering.
4. Normal activities are decelerated to stop loosing the existing internal heat. It includes but not limited to
o Reduced appetite.
o Reduced excretion of motion.
o Reduced digestion.
Increased fatigue of mind and body results in resting.