The process by which levels of substances in the blood, or other variables within the body, are maintained at a constant level.
The narrowing of blood vessels which restricts the flow of blood.
An area of the brain which regulates hormone release, temperature control, hunger, thirst and sleep.
The widening (dilation) of blood vessels which allows more blood to flow.
The transfer of heat by the upward movement of a heated, and therefore less dense, liquid or gas.
Protein molecules attached to cells that only bind to specific molecules with a particular structure
The emission of heat, light or other electromagnetic waves.
A watery liquid secreted by sweat glands, which contains dissolved urea, lactic acid and sodium, potassium and chloride ions.
Core body temperature is normally 37°C no matter what the temperature of the surroundings or the activity level of the individual. It is controlled by a negative feedback system.
The hypothalamus is the temperature-regulating centre of the brain. It contains receptors which are sensitive to the temperature of the blood flowing through the brain.
Temperature sensitive receptors in the skin also feed back information to the hypothalamus about the temperature of the skin surface.
Changes in core body temperature cause the hypothalamus to send nerve impulses to the sweat glands, muscles and blood vessels to raise or lower the temperature. If the core temperature goes up the body loses heat to bring it down again. If the core temperature goes down the body will conserve and even generate heat to bring it up again.