Engergy loss and energy gain from your body need to be balancewd so that your body temperature remains constant.
Controlling body temperature requires... Temperature receptors in the skin to detect the external temperature. Temperature receptors in the brain to measure the temperature of the blood. The braim which acts as a processing centre, to receive information from the temperature receptors, reponding by triggering the effectors. Effectors (sweats glands and muscles) to carry out to the automatic response.
If your body temperature is too high, heats needs to be transferred to the environment. This is done by sweating, since evaporation from the skin requires heat energy from the body.
If your body temperature is too low, your body will start to shiver. Shivering is the rapid contraction and release of muscles. These contractions require energy from increased repiration, and heat is released as a by-product, warming surrounding tissue.
Blood Temperatjure is monitored by a centre in your brain called the hypothalmaus.
In hot conditions, blood vessels in the skin dilate, allowing more blood to flow through the skin capillaries. This means that more heat is lost from the surface of the skin by radiation. This is called vasodilation.
In cold conditions, blood vessels in the skin constrict, reducing the amount of blood that flows through the skin capillaries. This means that less heat is lost from the surface of the skin by radiation. This is called vasoconstriction.