GENERAL HISTOLOGY

Detailed explanation-1: -Vasoconstriction is a response to being too cold. The process involves the narrowing of blood vessels at the skin surface to reduce heat loss through the surface of the skin. Vasodilation is a response to being too hot.

Detailed explanation-2: -The sweat evaporates, transferring heat energy from the skin to the environment. Blood vessels leading to the skin capillaries become wider-they dilate-allowing more blood to flow through the skin and more heat to be lost to the environment. This is called vasodilation .

Detailed explanation-3: -Vasodilation and vasoconstriction Blood vessels supplying blood to the skin can swell or dilate-vasodilation. This causes more heat to be carried by the blood to the skin, where it can be lost to the air.

Detailed explanation-4: -That’s because cooling your body via sweating relies on a principle of physics called “heat of vaporization.” It takes energy to evaporate sweat off of your skin, and that energy is heat. As your excess body heat is used to convert beads of sweat into vapor, you start to cool down.