QS Study

Regulation of Body Temperature in Hot Climate

Body temperature is the property of the body that determines whether or not the body is in thermal equilibrium with the environment. The anterior hypothalamic peptic area contains a large number of heat-sensitive neurons, which increase their firing rate two to tenfold in response to an increase in body temperature of 10°C. Hypothalamus control normal body temp though temp of air rise as high as 130°F. During the summertime, we tend to feel really warm, even though this temperature should, by definition, feel natural to our bodies. In hot climate temperature, decreasing mechanisms are –

(A) Increasing heat loss by –

Vasodilatation: by vasodilatation, the skin can cause heat transfer as much as eight-fold by radiation. This is caused by inhibition of sympathetic center.

Sweating: It increases the rate of evaporative heat loss. 10C increase in body temperature induces sufficient sweating to remove 10 times the basal rate of heat production.

Increased respiration: It increases evaporation heat loss.

(B) The decrease in heat production

By increasing –

  • Anorexia,
  • Apathy,
  • Inertia.

By decreasing –

  • Chemical thermogenesis.