Heat Gain and Heat Loss
Human Biology (Year 12) - Maintaining Temperature Balance
What is heat gain and heat loss?
In order to maintain a constant body temperature, we must balance heat production with heat loss.
If we are getting too cold, we must reduce heat loss whilst increasing heat production by increasing our level of activity or metabolism
If we get too hot the reverse must occur – decrease heat production by decreasing metabolism and increasing heat loss
Heat gain must be equal to heat loss.
The inputs and outputs of heat are as follows;
Heat from body processes (metabolism), in particular respiration of the liver and muscle cells
Heat gained from surroundings by conduction and radiation
Radiation, conduction and convection to surroundings
Evaporation of water from skin and lungs; warm air breathed out, warm urine and faeces