Consider the model of temperature regulation in humans. Instead of an increase in temperature, as seen here, imagine that the human bod temperature drops. Explain how this model would most likely change in response to a drop in temperature? A) Signals from the hypothalamus would stop B) The blood vessels move up and down in the skin C) Vasodilation would be replaced by vasoconstriction D) The vasodilation step in the model would include shivering

C) Vasodilation would be replaced by vasoconstriction

Explanation:

The blood vessels supplies blood to the skin can dilate this is called as vasodilation process. This process allows the transfer of more amount of heat from the blood to the skin where the heat can be lost through the air. The blood vessels can shrink again this is called as vasoconstriction. This process will prevent the loss of heat from the skin and the temperature of the body will be returned to the normal.  

If the human blood temperature drops vasodilation process will be prevented as more loss of heat can lead to excess cooling of the body for example frostbite or even death. The frostbite is an injury which is caused due to freezing of the skin as well as the underlying tissues.

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