How The Human Body Temperature Maintained In Hot Day And Cold Day?

On a COLD day our thermoreceptors (found in both our skin and in our brain) monitor changes in the external temperature and our body begins to minimise the blood flow to our skin by constricting our arterioles (very small arteries). This is called vasoconstriction and results in our skin turning pale and losing less heat through radiation.
Our bodt also increases its rate of heat production (a product of cellular respiration) Our bodies can aslo gain heat through muscular activity, that is why we shiver when we are cold (shivering is the rapid involuntary contraction of our skeletal muscles)

On a HOT day our thermoreceptors monitor changes in the external temperature and our body begins to increase the blood flow to our skin, this results in us having a flushed red look. For this to happen, our arterioles dilate  (vasodilation) and our liver becomes less active.
Our bodies can also lose heat through radiation and sweating, the evaporation of your sweat causes a significant cooling effect. However if you undertake strenuous exercise under humid comditions your body will secrete sweat faster than it can be absorbed, and sweat collects on your skin. It is very dangerous to do this as it can cause heat stroke or heat exhaustion can occur.

On a COLD day, our thermoreceptors (found in the hypothalamus, in both our skin and in our brain.) monitor changes in the external temperature and begin to minimise the blood flow to our skin (vasoconstriction). This is done by constricting our arterioles (very small arteries). Vasoconstriction results in our skin turning pale and less heat is lost through radiation. Our liver becomes more active and increases our body's heat production, this is a product of cellular respiration. Our body can gain heat also by muscular activity, that is why we shiver when we are cold.On a HOT day our thermoreceptors monitor changes in the external temperature and our body increases blood flow to our skin (vasodilation) resulting in a flushed look. This is done by our arterioles dilating and our liver becoming less active.Heat is lost from our body through radiation, and our sweat glands produce more sweat, the evaporation of our sweat causes a significant cooling effect for our bodies.