Homeostasis:temperature regulationIs temperature regulation a voluntary or involuntary action? describe the pathway taken by the nerve impulses

I'm assuming you are talking about mammals here, because
it makes a difference. Thermoregulation in mammals is an involuntary process based on
feedback loops. The main control system is in the anterior region of the hypothalamus,
which contains temperature sensitive neurons which monitor blood temperature. The
hypothalamus also receives temperature information from sensory neurons scattered
throughout the body.

The hypothalamus has control over most
of the temperature maintenance mechanisms. Although it has been referred to as the
body's thermostat, the analogy is not a good one, since thermostats  are simply on-off
controls, and the hypothalamus can send out a range of
responses.

If the body core begins to cool, the
hypothalamus can cause vasoconstriction, which shunts blood flow away from the skin and
extremities to help slow down heat loss. The hypothalamus can also initiate shivering,
which burns calories and produces heat, and it can increase cell metabolism so that fat
is converted into warmth.

If the core temperature rises,
vasodilation shunts blood to the skin's surface so heat can be lost. The hypothalamus
also has control over the eccrine glands, which produce sweat that can evaporate and
carry away energy from the body in the process.

There are
voluntary thermoregulatory activities that mammals do as well, which probably evolved
because they increase the efficiency of the involuntary mechanisms. These include things
like  moving to a warmer or cooler spot, becoming more or less physically active, and
seeking shade or sunshine. While they support the involuntary mechanism, they cannnot
replace it.