MICROANATOMY

Detailed explanation-1: -Normally, the vessels that supply blood to the skin constrict or narrow in response to cold temperatures. This reaction, called “vasoconstriction, ‘’ decreases blood flow to the skin, which helps to minimize heat loss from the warm blood and therefore preserve a normal internal or “core” temperature.

Detailed explanation-2: -Cold causes blood vessels to constrict; heat causes them to open up. Under normal circumstances, blood vessels relax in hot weather to increase blood flow to the surface of the skin, helping the body to cool down.

Detailed explanation-3: -Shrinking the diameter of blood vessels that supply the skin, a process known as vasoconstriction, reduces blood flow and helps retain heat.

Detailed explanation-4: -Blood vessels, which lead to the skin capillaries, become narrower-they constrict – which allows less blood to flow through the skin and conserve the core body temperature. This is called vasoconstriction .

Detailed explanation-5: -Vasoconstriction warms the body by reducing heat loss from the blood vessels of the skin. Vasodilation cools the body by increasing heat loss from the blood vessels of the skin.