Homeostasis - martab

• Energy loss and energy gain from your body need to be balanced so that your body temperature remains constant.
• Energy is transformed from the blood to the tissue when it reaches the cooler parts.

Controllong body temperature requires:

• Temp. receptors in the skin (external temp.)
• Temp. receptors in the brain (measure temp of body)
• The brain (processing centre, to recieve info from the receptors. responding by triggering the effectors)
• Effectors to carry out the automatic response (sweat gland and muscle).

  If body temp. too high, heat needs to be transferred to the enviroment. Done by sweating (evaporation). 

Blood temperature is monitored by a centre in your brain called hypothalamus.

Hot conditions:

• Blood vessels in the skin dilate - allows more blood to flow through capillaries.
• Means more heat lost from the surface of the skin be radiation.
• Called Vasolidation

Cold conditiond:

• Blood vessels in the skin constrict - reducing the amount of amount of blood that flows through the skin capillaries.
• Means less heat is lost from the surface of the skin by radiation.
• Called Vasoconstriction.