2.77b- Thermoregulation

Understand that Homeostasis is the maintenance of a constant internal environment and that body water content and body temperature are both examples of homeostasis

• Negative feedback loop is a method of control and maintaining constant conditions
• Receptors- Hypothalamus responds to the temperature of the blood
• The ideal temperature in a human is 37-38 degrees
• The temperature is fed back to the brain so that the required changes in the temperature can be made
• Effectors- Skin can be used to change the temperature of the blood 
• Skin:
• Sweat Glands- used to control body temperature
• Capillary networks- allow blood to move closer or further away from the surface of the skin
• If body temperature increases, the hypothalamus will make the body cool down by:
• Sweating
• Increase blood flow, the blood vessels dilate which increases the exchange of heat to the outside of the body by the processes of radiation and evaporation of sweat
• If body temperature decreases, the hypothalamus will make the body heat up by:
• Shivering 
• Vasoconstriction
• Raised hairs