why does the body temperature rise when a person has a fever
Answers
Answer: When the body temperature rises because of an infection, it's called fever. Fevers are caused by chemicals in the bloodstream called pyrogens. Pyrogens make their way to the brain's hypothalamus, which is in charge of regulating body temperature. When those pyrogens bind to certain receptors in the hypothalamus, the body temperature rises.
One common pyrogen is Interleukin-1 (also called IL-1). IL-1 is produced by white blood cells that are called macrophages when they connect with certain bacteria and viruses. IL-1 has multiple purposes. An important purpose is to signal white blood cells, called helper T cells, into action.
Doctors think one reason for a fever is to raise the body's temperature enough to kill off bacteria and viruses that are sensitive to temperature changes. In debate right now is whether we should be trying to lower fevers. Aspirin, for example, will reduce fever. Still, if the fever is helping rid the body of infection, then lowering it could be counterproductive. On the other hand, people sometimes die from fever. The general medical consensus right now leans to the "reduce the fever" side of the fence.
Answer:
When a person has fever, it means that his body temperature has risen and that he is infected with a virus. Just like when germs get killed when we boils water, the temperature of our body rises to fight the virus.
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