AP BIOLOGY

Detailed explanation-1: -Pilorelaxation occurs in hot environments to flatten the hairs and reduce the amount of air trapped between skin and hair. This enhances heat loss and reduces body temperature.

Detailed explanation-2: -When heat activates sweat glands, these glands bring that water, along with the body’s salt, to the surface of the skin as sweat. Once on the surface, the water evaporates. Water evaporating from the skin cools the body, keeping its temperature in a healthy range.

Detailed explanation-3: -The hairs on the skin also help to control body temperature. The hairs lie flat when we are warm, and rise when we are cold. If we are too cold nerve impulses are sent to the hair erector muscles which contract. This raises the skin hairs and traps a layer of insulating air next to the skin.

Detailed explanation-4: -If you have heat damaged hair, your strands have been weakened, and you might notice you’re losing more hair than normal when you brush or shower. This could be because of a lack of protein since damaged hair experiences break downs in the bonds – fats, oils, water, and protein-that make up each strand.

Detailed explanation-5: -Turns out there are four methods for body heat loss: radiation, conduction, convection and evaporation.