Answer: Skin
The thermo-receptor
neurons, which is found in the skin is responsible in sending signals to the
brain that the outside environment is very cold. This information will undergo
processing in the hypothalamus of the brain that produce different responses so
the body can cope with the changes in body’s temperature.
When it is cold, the
body response by vasoconstriction where the arterioles gets smaller to reduce
blood from going to the skin, keeping the core warm. Moreover, rapid contraction
and relaxing of skeletal muscles through shivering will produce heat by
respiration. Then, hairs on skin stand up and body will curl up to make surface
area smaller allowing the body to keep warm.
