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Powerpoint Presentation: Thermoregulation

 

Homeostasis Index

Homeostasis : Introduction
The hormone pathway
The Pancreas, Insulin and Glucagon Fact Sheet
The homeostatic control of blood glucose levels
Homeostatic control of water balance

Topic Chapters Index

 

Heat loss and heat gain

The body must balance its heat budget.

Heat is gained:

  • by conduction from warm air surrounding the body.

  • by the body's metabolic activity which generates heat e.g. when muscle move.

Heat is lost

  • by conduction and radiation to cold air (or water),

  • by evaporation of sweat from the body surface (c.f. Properties of Water).

Humans can also affect their body temperature by changing their behaviour. e.g. wearing different clothes, seeking shade

 

 

HOMEOSTASIS

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Thermoregulation

The core temperature of the human body is 37°C

The core of the human body includes the organs of the trunk (thorax and abdomen) and the head. This is where the vital organs are located and their enzyme systems must operate in optimum conditions.

The periphery of the body can withstand some deviation from the core temperature.

 

Maintaining the body temperature

Keeping warm

Staying cool

Increased insulation, subcutaneous fat reduces the conduction of heat from the body

Increase blood flow to skin, increases conduction and radiation of heat from the body.

Reduced sweating decreases evaporation.

Increased sweat secretion, increases evaporation

Increased shivering, increases heat produced by muscle tissue 2 to 5 times.

Reduced activity.

 

Maintaining the body temperature

 

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