Answer :
The body organs would stop functioning properly.
If it's correct, I'm happy to help:)
The rise in the body temperature results in heatstroke. In heat exhaustion the temperature of the body gets too hot. This happens as a result of internal temperature increase which reaches at least 104°F Heat exhaustion can lead to heat stroke. Heat stroke can lead to more serious problems such as organ failure and brain damage. In extreme conditions heat stroke can lead to death of the patient.
When the temperature of the body drops then the heart and the nervous system of the body does not work properly.This can be caused due to cold weather conditions or staying in cold water for a long period of time.