GENERAL HISTOLOGY

Detailed explanation-1: -When the body temperature rises, such as when exercising on a hot day, the dermal blood vessels dilate, and the sweat glands begin to secrete more sweat. The evaporation of the sweat from the surface of the skin cools the body by dissipating heat.

Detailed explanation-2: -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. Blood vessels can shrink down again-vasoconstriction. This reduces heat loss through the skin once the body’s temperature has returned to normal.

Detailed explanation-3: -DERMIS. The dermis is most notable for the stem cells that replete the constantly shedding epidermis. It also contains the vessels that regulate body temperature, the arterioles. These small vessels respond to heat by dilating, increasing blood flow through the skin, resulting in heat leaving the body.