Explain how the mammalian skin is adapted to perform its functions

K.C.S.E Biology Q & A - MODEL 1996PP1QN 21

Explain how the mammalian skin is adapted to perform its functions

ANSWERS

​The cornified  layer is made  up of dead  cells, that prevent entry of bacteria  and  prevent physical  damage; melanin  protects the  body against U-V variation; sebaceous glands produce a chemical/ ring  substance  which  is of blood  vessel; which when the body temperature  is high dilate  and  heat is lost  or when body temp is low blood  vessels  constrict. 
And  heat is retained. Hair  when it is  called, stands and traps air  between themselves; to  retain heat/ stop heat  loss or  when it is hot hair  lies flat  close  on the  skin; so does  not trap  air, and therefore  heat  is retained and sweat is lost; the skin has  sweat glands which produces sweat; 
sweat evaporates thus cooling the body.