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Describe the role of the following organ in excretion and homeostasis.
The skin during hot environmental condition.

Answer Text:
-Sweat glands excrete urea, excess water and salts hence maintaining salt & water balance in the blood. Evaporation of sweat cools the body due to loss of latent heat of vaporization; when the body temperature rises blood vessels in the skin vasolidate allowing more blood to flow near the skin surface thus heat is lost to the environment by radiation/convection.
-The erctorpili muscle relaxes hair flattens in a hot environment reducing insulation hence heat is lost from the body by radiation convection to the
environment.